HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Data Sheet Jan. 2003, V1.1 Features • DLL aligns DQ and DQS transitions with CK CAS Latency and Frequency transitions Maximum Operating Frequency (MHz) • Commands entered on each positive CK edge; CAS Latency DDR200 DDR266A DDR266 DDR333 -8 -7 -7F -6 data and data mask referenced to both edges of 2 100 133 133 133 DQS 2.5 125 143 143 166 • Burst Lengths: 2, 4, or 8 • CAS Latency: (1.5), 2, 2.5, (3) • Double data rate architecture: two data transfers per clock cycle • Auto Precharge option for each burst access • Bidirectional data strobe (DQS) is transmitted • Auto Refresh and Self Refresh Modes and received with data, to be used in capturing •7.8�s Maximum Average Periodic Refresh data at the receiver Interval (8K refresh) • DQS is edge-aligned with data for reads and is • 2.5V (SSTL_2 compatible) I/O center-aligned with data for writes •V = 2.5V ± 0.2V / V = 2.5V ± 0.2V DDQ DD • Differential clock inputs (CK and CK) • TSOP66 package • Four internal banks for concurrent operation • 60 balls BGA w/ 3 depop rows (“chipsize pack- • Data mask (DM) for write data age”) 12 mm x 8 mm. Description The 256Mb DDR SDRAM is a high-speed CMOS, row to be accessed. The address bits registered coinci- dynamic random-access memory containing 268,435,456 dent with the Read or Write command are used to select bits. It is internally configured as a quad-bank DRAM. the bank and the starting column location for the burst access. The 256Mb DDR SDRAM uses a double-data-rate archi- tecture to achieve high-speed operation. The double data The DDR SDRAM provides for programmable Read or rate architecture is essentially a 2n prefetch architecture Write burst lengths of 2, 4 or 8 locations. An Auto Pre- with an interface designed to transfer two data words per charge function may be enabled to provide a self-timed clock cycle at the I/O pins. A single read or write access row precharge that is initiated at the end of the burst for the 256Mb DDR SDRAM effectively consists of a sin- access. gle 2n-bit wide, one clock cycle data transfer at the inter- As with standard SDRAMs, the pipelined, multibank archi- nal DRAM core and two corresponding n-bit wide, one- tecture of DDR SDRAMs allows for concurrent operation, half-clock-cycle data transfers at the I/O pins. thereby providing high effective bandwidth by hiding row A bidirectional data strobe (DQS) is transmitted externally, precharge and activation time. along with data, for use in data capture at the receiver. An auto refresh mode is provided along with a power-sav- DQS is a strobe transmitted by the DDR SDRAM during ing power-down mode. All inputs are compatible with the Reads and by the memory controller during Writes. DQS JEDEC Standard for SSTL_2. All outputs are SSTL_2, is edge-aligned with data for Reads and center-aligned Class II compatible. with data for Writes. Note: The functionality described and the timing specifi- The 256Mb DDR SDRAM operates from a differential cations included in this data sheet are for the DLL Enabled clock (CK and CK; the crossing of CK going HIGH and CK going LOW is referred to as the positive edge of CK). mode of operation. Commands (address and control signals) are registered at every positive edge of CK. Input data is registered on both edges of DQS, and output data is referenced to both edges of DQS, as well as to both edges of CK. Read and write accesses to the DDR SDRAM are burst oriented; accesses start at a selected location and con- tinue for a programmed number of locations in a pro- grammed sequence. Accesses begin with the registration of an Active command, which is then followed by a Read or Write command. The address bits registered coincident with the Active command are used to select the bank and 2003-01-09, V1.1 Page 1 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Ordering Information CAS-RCD-RP Clock CAS-RCD-RP Clock a Org. Speed Package Part Number Latencies (MHz) Latencies (MHz) HYB25D256400BT(L)-6 x4 2.5-3-3 166 2-3-3 133 DDR333 66 Pin P-TSOP-II HYB25D256800BT(L)-6 x8 HYB25D256160BT(L)-6 x16 HYB25D256400BT(L)-7 x4 143 DDR266A HYB25D256800BT(L)-7 x8 HYB25D256160BT(L)-7 x16 HYB25D256400BT(L)-7F x4 2-2-2 DDR266 HYB25D256800BT(L)-7F x8 HYB25D256160BT(L)-7F x16 HYB25D256400BT(L)-8 x4 125 100 DDR200 HYB25D256800BT(L)-8 x8 HYB25D256160BT(L)-8 x16 HYB25D256400BC(L)-6 x4 2.5-3-3 166 2-3-3 133 DDR333 60 Balls P-FBGA HYB25D256800BC(L)-6 x8 HYB25D256160BC(L)-6 x16 HYB25D256400BC(L)-7 x4 143 DDR266A HYB25D256800BC(L)-7 x8 HYB25D256160BC(L)-7 x16 HYB25D256400BC(L)-7F x4 2-2-2 DDR266 HYB25D256800BC(L)-7F x8 HYB25D256160BC(L)-7F x16 HYB25D256400BC(L)-8 x4 125 100 DDR200 HYB25D256800BC(L)-8 x8 HYB25D256160BC(L)-8 x16 a. HYB: designator for memory components 25D: DDR-I SDRAMs at Vddq=2.5V 256: 256Mb density 400/800/160: Product variations x4, x8 and x16 B: Die revision B C/T: Package type FBGA and TSOP L: Low power version (optional) - these components are specifically selected for low IDD6 Self Refresh currents -5/6/7/7F/8: speed grade - see table 2003-01-09, V1.1 Page 2 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Pin Configuration (TSOP66) V V V 1 66 V V V DD DD DD SS SS SS NC DQ0 DQ0 DQ15 DQ7 NC 2 65 V V V V V V 3 64 DDQ DDQ DDQ SSQ SSQ SSQ NC DQ1 NC 4 63 DQ14 NC NC DQ0 DQ2 DQ1 5 62 DQ13 DQ6 DQ3 V V V 6 61 V V V SSQ SSQ DDQ DDQ DDQ SSQ NC NC DQ3 7 60 DQ12 NC NC NC DQ4 DQ11 DQ5 NC DQ2 8 59 V V V V V V 9 58 DDQ DDQ DDQ SSQ SSQ SSQ NC DQ5 DQ10 NC NC NC 10 57 DQ3 DQ1 DQ6 DQ9 DQ4 DQ2 11 56 V V V V V V 12 55 SSQ SSQ SSQ DDQ DDQ DDQ NC NC DQ7 13 54 DQ8 NC NC NC NC NC 14 53 NC NC NC V 15 52 V V V V V SSQ SSQ SSQ DDQ DDQ DDQ NC NC LDQS UDQS DQS DQS 16 51 NC NC NC NC NC NC 17 50 V V V V V V 18 49 DD DD DD REF REF REF NC NC NC 19 48 V V V SS SS SS NC NC LDM 20 47 UDM DM DM WE WE WE CK CK CK 21 46 CAS CAS CAS CK CK CK 22 45 RAS RAS RAS CKE CKE CKE 23 44 CS CS CS 24 43 NC NC NC NC NC NC A12 A12 A12 42 25 BA0 BA0 BA0 A11 A11 A11 26 41 BA1 BA1 BA1 A9 A9 A9 27 40 A10/AP A8 A8 A8 A10/AP A10/AP 28 39 A7 A7 A7 A0 A0 A0 29 38 A1 A1 A1 A6 A6 A6 30 37 A2 A2 A2 A5 A5 A5 31 36 A3 A3 A3 A4 A4 A4 32 35 V V V V V V DD DD DD 33 34 SS SS SS 16Mb x 16 32Mb x 8 64Mb x 4 2003-01-09, V1.1 Page 3 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Pin Configuration (FBGA) 123 78 9 123 7 8 9 VSSQ NC VSS A VDD NC VDDQ VSSQ DQ7 VSS A VDD DQ0 VDDQ NC VDDQ DQ3 B DQ0 VSSQ NC NC VDDQ DQ6 B DQ1 VSSQ NC NC VSSQ NC C NC VDDQ NC NC VSSQ DQ5 C DQ2 VDDQ NC NC VDDQ DQ2 D DQ1 VSSQ NC NC VDDQ DQ4 D DQ3 VSSQ NC NC VSSQ DQS E NC VDDQ NC NC VSSQ DQS E NC VDDQ NC VREF VSS DM F NC VDD NC VREF VSS DM F NC VDD NC CLK CLK GWE CAS CLK CLK GWE CAS A12 CKE H RAS CS A12 CKE H RAS CS A11 A9 J BA1 BA0 A11 A9 J BA1 BA0 A8 A7 K A0 A10/AP A8 A7 K A0 A10/AP A6 A5 L A2 A1 A6 A5 L A2 A1 A4 VSS M VDD A3 A4 VSS M VDD A3 ( x 4 ) ( x8 ) Top View (see the balls through the package) 123 78 9 VSSQ DQ15 VSS A VDD DQ0 VDDQ DQ14 VDDQ DQ13 B DQ2 VSSQ DQ1 DQ12 VSSQ DQ11 C DQ4 VDDQ DQ3 DQ10 VDDQ DQ9 D DQ6 VSSQ DQ5 DQ8 VSSQ UDQS E LDQS VDDQ DQ7 VREF VSS UDM F LDM VDD NC CLK CLK GWE CAS A12 CKE H RAS CS A11 A9 J BA1 BA0 A8 A7 K A0 A10/AP A6 A5 L A2 A1 A4 VSS M VDD A3 ( x 16 ) 2003-01-09, V1.1 Page 4 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Input/Output Functional Description Symbol Type Function Clock: CK and CK are differential clock inputs. All address and control input signals are sam- CK, CK Input pled on the crossing of the positive edge of CK and negative edge of CK. Output (read) data is referenced to the crossings of CK and CK (both directions of crossing). Clock Enable: CKE HIGH activates, and CKE Low deactivates, internal clock signals and device input buffers and output drivers. Taking CKE Low provides Precharge Power-Down and Self Refresh operation (all banks idle), or Active Power-Down (row Active in any bank). CKE Input CKE is synchronous for power down entry and exit, and for self refresh entry. CKE is asyn- chronous for self refresh exit. CKE must be maintained high throughout read and write accesses. Input buffers, excluding CK, CK and CKE are disabled during power-down. Input buffers, excluding CKE, are disabled during self refresh. Chip Select: All commands are masked when CS is registered HIGH. CS provides for exter- CS Input nal bank selection on systems with multiple banks. CS is considered part of the command code. The standard pinout includes one CS pin. RAS, CAS, WE Input Command Inputs: RAS, CAS and WE (along with CS) define the command being entered. Input Data Mask: DM is an input mask signal for write data. Input data is masked when DM is sampled HIGH coincident with that input data during a Write access. DM is sampled on DM Input both edges of DQS. Although DM pins are input only, the DM loading matches the DQ and DQS loading. Bank Address Inputs: BA0 and BA1 define to which bank an Active, Read, Write or Pre- BA0, BA1 Input charge command is being applied. BA0 and BA1 also determines if the mode register or extended mode register is to be accessed during a MRS or EMRS cycle. Address Inputs: Provide the row address for Active commands, and the column address and Auto Precharge bit for Read/Write commands, to select one location out of the memory array in the respective bank. A10 is sampled during a Precharge command to determine A0 - A12 Input whether the Precharge applies to one bank (A10 LOW) or all banks (A10 HIGH). If only one bank is to be precharged, the bank is selected by BA0, BA1. The address inputs also provide the op-code during a Mode Register Set command. DQ Input/Output Data Input/Output: Data bus. Data Strobe: Output with read data, input with write data. Edge-aligned with read data, cen- DQS Input/Output tered in write data. Used to capture write data. NC No Connect: No internal electrical connection is present. V Supply DQ Power Supply: 2.5V ��0.2V. DDQ V Supply DQ Ground SSQ V Supply Power Supply: 2.5V ��0.2V. DD V Supply Ground SS V Supply SSTL_2 reference voltage: (V / 2) REF DDQ 2003-01-09, V1.1 Page 5 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Block Diagram (64Mb x 4) CKE CK CK CS WE CAS Bank3 RAS Bank2 Bank1 CK, CK DLL Mode 13 Registers 8192 Bank0 Memory Data 13 Array (8192 x 1024 x 8) 4 8 4 Sense Amplifiers 4 DQS 1 Generator DQ0-DQ3, DM COL0 DQS Input I/O Gating 8 Register 2 DQS DM Mask Logic A0-A12, Mask 1 1 Write 15 1 BA0, BA1 FIFO 1 1 & 8 2 2 1024 Drivers (x8) 4 4 8 4 clk clk 4 4 Column in out Data Decoder 10 COL0 CK, Column-Address 11 CK Counter/Latch COL0 1 1 Note: This Functional Block Diagram is intended to facilitate user understanding of the operation of the device; it does not represent an actual circuit implementation. Note: DM is a unidirectional signal (input only), but is internally loaded to match the load of the bidi- rectional DQ and DQS signals. 2003-01-09, V1.1 Page 6 of 77 Command Decode Address Register Control Logic 13 Refresh Counter Row-Address MUX Bank Control Logic Bank0 Row-Address Latch & Decoder 8192 Read Latch MUX Receivers Drivers HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Block Diagram (32Mb x 8) CKE CK CK CS WE CAS Bank3 RAS Bank2 Bank1 CK, CK DLL Mode 13 Registers 8192 Bank0 Memory Data 13 Array (8192 x 512x 16) 8 16 8 Sense Amplifiers 8 DQS 1 Generator DQ0-DQ7, DM COL0 DQS Input I/O Gating 16 Register 2 DQS DM Mask Logic A0-A12, Mask 1 1 Write 15 1 BA0, BA1 FIFO 1 1 & 16 2 2 512 Drivers (x16) 8 8 16 8 clk clk 8 8 Column in out Data Decoder 9 COL0 CK, Column-Address 10 CK Counter/Latch COL0 1 1 Note: This Functional Block Diagram is intended to facilitate user understanding of the operation of the device; it does not represent an actual circuit implementation. Note: DM is a unidirectional signal (input only), but is internally loaded to match the load of the bidi- rectional DQ and DQS signals. 2003-01-09, V1.1 Page 7 of 77 Command Decode Address Register Control Logic Refresh Counter 13 Row-Address MUX Bank Control Logic Bank0 Row-Address Latch & Decoder 8192 Read Latch MUX Receivers Drivers HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Block Diagram (16Mb x 16) CKE CK CK CS WE CAS Bank3 RAS Bank2 Bank1 CK, CK DLL Mode 13 Registers 8192 Bank0 Memory Data 13 Array (8192 x 256x 32) 16 32 16 Sense Amplifiers 16 1 DQS Generator DQ0-DQ15, DM COL0 DQS Input I/O Gating 32 Register 2 LDQS, UDQS DM Mask Logic 1 1 A0-A11, Mask Write 15 1 BA0, BA1 FIFO 1 1 & 32 2 2 256 Drivers (x32) 16 16 32 16 16 16 clk clk Column out in Data Decoder 8 COL0 CK, Column-Address 9 CK Counter/Latch COL0 2 1 Note: This Functional Block Diagram is intended to facilitate user understanding of the operation of the device; it does not represent an actual circuit implementation. Note: UDM and LDM are unidirectional signals (input only), but is internally loaded to match the load of the bidirectional DQ , UDQS and LDQS signals. 2003-01-09, V1.1 Page 8 of 77 Command Decode Address Register Control Logic 13 Refresh Counter Row-Address MUX Bank Control Logic Bank0 Row-Address Latch & Decoder 8192 Read Latch MUX Drivers Receivers HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Functional Description The 256Mb DDR SDRAM is a high-speed CMOS, dynamic random-access memory containing 268, 435, 456 bits. The 256Mb DDR SDRAM is internally configured as a quad-bank DRAM. The 256Mb DDR SDRAM uses a double-data-rate architecture to achieve high-speed operation. The double- data-rate architecture is essentially a 2n prefetch architecture, with an interface designed to transfer two data words per clock cycle at the I/O pins. A single read or write access for the 256Mb DDR SDRAM consists of a single 2n-bit wide, one clock cycle data transfer at the internal DRAM core and two corresponding n-bit wide, one-half clock cycle data transfers at the I/O pins. Read and write accesses to the DDR SDRAM are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. Accesses begin with the regis- tration of an Active command, which is then followed by a Read or Write command. The address bits regis- tered coincident with the Active command are used to select the bank and row to be accessed (BA0, BA1 select the bank; A0-A12 select the row). The address bits registered coincident with the Read or Write com- mand are used to select the starting column location for the burst access. Prior to normal operation, the DDR SDRAM must be initialized. The following sections provide detailed infor- mation covering device initialization, register definition, command descriptions and device operation. Initialization DDR SDRAMs must be powered up and initialized in a predefined manner. Operational procedures other than those specified may result in undefined operation. The following criteria must be met: No power sequencing is specified during power up or power down given the following criteria: V and V are driven from a single power converter output AND DD DDQ V meets the specification AND TT V tracks V /2 REF DDQ or The following relationship must be followed: V is driven after or with V such that V < V + 0.3 V DDQ DD DDQ DD V is driven after or with V such that V < V + 0.3V TT DDQ TT DDQ V is driven after or with V such that V < V + 0.3V REF DDQ REF DDQ The DQ and DQS outputs are in the High-Z state, where they remain until driven in normal operation (by a read access). After all power supply and reference voltages are stable, and the clock is stable, the DDR SDRAM requires a 200�s delay prior to applying an executable command. Once the 200�s delay has been satisfied, a Deselect or NOP command should be applied, and CKE should be brought HIGH. Following the NOP command, a Precharge ALL command should be applied. Next a Mode Register Set command should be issued for the Extended Mode Register, to enable the DLL, then a Mode Register Set command should be issued for the Mode Register, to reset the DLL, and to program the operat- ing parameters. 200 clock cycles are required between the DLL reset and any executable command. During the 200 cycles of clock for DLL locking, a Deselect or NOP command must be applied. After the 200 clock cycles, a Precharge ALL command should be applied, placing the device in the “all banks idle” state. Once in the idle state, two AUTO REFRESH cycles must be performed. Additionally, a Mode Register Set command for the Mode Register, with the reset DLL bit deactivated (i.e. to program operating parameters without resetting the DLL) must be performed. Following these cycles, the DDR SDRAM is ready for normal operation. 2003-01-09, V1.1 Page 9 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Register Definition Mode Register The Mode Register is used to define the specific mode of operation of the DDR SDRAM. This definition includes the selection of a burst length, a burst type, a CAS latency, and an operating mode. The Mode Reg- ister is programmed via the Mode Register Set command (with BA0 = 0 and BA1 = 0) and retains the stored information until it is programmed again or the device loses power (except for bit A8, which is self-clearing). Mode Register bits A0-A2 specify the burst length, A3 specifies the type of burst (sequential or interleaved), A4-A6 specify the CAS latency, and A7-A12 specify the operating mode. The Mode Register must be loaded when all banks are idle, and the controller must wait the specified time before initiating the subsequent operation. Violating either of these requirements results in unspecified opera- tion. Burst Length Read and write accesses to the DDR SDRAM are burst oriented, with the burst length being programmable. The burst length determines the maximum number of column locations that can be accessed for a given Read or Write command. Burst lengths of 2, 4, or 8 locations are available for both the sequential and the interleaved burst types. Reserved states should not be used, as unknown operation or incompatibility with future versions may result. When a Read or Write command is issued, a block of columns equal to the burst length is effectively selected. All accesses for that burst take place within this block, meaning that the burst wraps within the block if a boundary is reached. The block is uniquely selected by A1-Ai when the burst length is set to two, by A2-Ai when the burst length is set to four and by A3-Ai when the burst length is set to eight (where Ai is the most significant column address bit for a given configuration). The remaining (least significant) address bit(s) is (are) used to select the starting location within the block. The programmed burst length applies to both Read and Write bursts. 2003-01-09, V1.1 Page 10 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Mode Register Operation BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Address Bus 0* 0* Mode Register CAS Latency BT Burst Length Operating Mode A12 - A9 A8 A7 A6 - A0 Operating Mode Normal operation A3 Burst Type 0 0 0 Valid Do not reset DLL 0 Sequential Normal operation 1 Interleave 0 1 0 Valid in DLL Reset 00 1 Reserved Reserved �� � CAS Latency Burst Length A6 A5 A4 Latency A2 A1 A0 Burst Length 000 Reserved 000 Reserved 001 Reserved 001 2 010 2 010 4 0 1 1 3 (optional) 011 8 100 Reserved 100 Reserved 1 0 1 1.5 (optional) 101 Reserved 110 2.5 110 Reserved 111 Reserved 111 Reserved * BA0 and BA1 must be 0, 0 to select the Mode Register (vs. the Extended Mode Register). 2003-01-09, V1.1 Page 11 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Burst Definition Starting Column Address Order of Accesses Within a Burst Burst Length A2 A1 A0 Type = Sequential Type = Interleaved 0 0-1 0-1 2 11-0 1-0 0 0 0-1-2-3 0-1-2-3 0 1 1-2-3-0 1-0-3-2 4 1 0 2-3-0-1 2-3-0-1 1 1 3-0-1-2 3-2-1-0 0 0 0 0-1-2-3-4-5-6-7 0-1-2-3-4-5-6-7 0 0 1 1-2-3-4-5-6-7-0 1-0-3-2-5-4-7-6 0 1 0 2-3-4-5-6-7-0-1 2-3-0-1-6-7-4-5 0 1 1 3-4-5-6-7-0-1-2 3-2-1-0-7-6-5-4 8 1 0 0 4-5-6-7-0-1-2-3 4-5-6-7-0-1-2-3 1 0 1 5-6-7-0-1-2-3-4 5-4-7-6-1-0-3-2 1 1 0 6-7-0-1-2-3-4-5 6-7-4-5-2-3-0-1 1 1 1 7-0-1-2-3-4-5-6 7-6-5-4-3-2-1-0 Notes: 1. For a burst length of two, A1-Ai selects the two-data-element block; A0 selects the first access within the block. 2. For a burst length of four, A2-Ai selects the four-data-element block; A0-A1 selects the first access within the block. 3. For a burst length of eight, A3-Ai selects the eight-data- element block; A0-A2 selects the first access within the block. 4. Whenever a boundary of the block is reached within a given sequence above, the following access wraps within the block. Burst Type Accesses within a given burst may be programmed to be either sequential or interleaved; this is referred to as the burst type and is selected via bit A3. The ordering of accesses within a burst is determined by the burst length, the burst type and the starting column address, as shown in Burst Definition on page 12. Read Latency The Read latency, or CAS latency, is the delay, in clock cycles, between the registration of a Read command and the availability of the first burst of output data. The latency can be programmed 2, 2.5 or 3 clocks. CAS latency of 1.5 is an optional feature on this device. If a Read command is registered at clock edge n, and the latency is m clocks, the data is available nominally coincident with clock edge n + m. Reserved states should not be used as unknown operation or incompatibility with future versions may result. 2003-01-09, V1.1 Page 12 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Operating Mode The normal operating mode is selected by issuing a Mode Register Set Command with bits A7-A12 set to zero, and bits A0-A6 set to the desired values. A DLL reset is initiated by issuing a Mode Register Set com- mand with bits A7 and A9-A12 each set to zero, bit A8 set to one, and bits A0-A6 set to the desired values. A Mode Register Set command issued to reset the DLL should always be followed by a Mode Register Set command to select normal operating mode. All other combinations of values for A7-A12 are reserved for future use and/or test modes. Test modes and reserved states should not be used as unknown operation or incompatibility with future versions may result. Required CAS Latencies CAS Latency = 2, BL = 4 CK CK Command Read NOP NOP NOP NOP NOP CL=2 DQS DQ CAS Latency = 2.5, BL = 4 CK CK Command Read NOP NOP NOP NOP NOP CL=2.5 DQS DQ Don’t Care Shown with nominal t , t , and t . AC DQSCK DQSQ 2003-01-09, V1.1 Page 13 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Extended Mode Register The Extended Mode Register controls functions beyond those controlled by the Mode Register; these addi- tional functions include DLL enable/disable, and output drive strength selection (optional). These functions are controlled via the bits shown in the Extended Mode Register Definition. The Extended Mode Register is programmed via the Mode Register Set command (with BA0 = 1 and BA1 = 0) and retains the stored informa- tion until it is programmed again or the device loses power. The Extended Mode Register must be loaded when all banks are idle, and the controller must wait the specified time before initiating any subsequent oper- ation. Violating either of these requirements result in unspecified operation. DLL Enable/Disable The DLL must be enabled for normal operation. DLL enable is required during power up initialization, and upon returning to normal operation after having disabled the DLL for the purpose of debug or evaluation. The DLL is automatically disabled when entering self refresh operation and is automatically re-enabled upon exit of self refresh operation. Any time the DLL is enabled, 200 clock cycles must occur before a Read command can be issued. This is the reason 200 clock cycles must occur before issuing a Read or Write command upon exit of self refresh operation. Output Drive Strength The normal drive strength for all outputs is specified to be SSTL_2, Class II. In addition this design version supports a weak driver mode for lighter load and/or point-to-point environments which can be activated during mode register set. I-V curves for the normal and weak drive strength are included in this document. 2003-01-09, V1.1 Page 14 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Extended Mode Register Definition A BA1 BA0 12 A A A A A A A A A A A A Address Bus 11 10 9 8 7 6 5 4 3 2 1 0 Extended 0 0* 1* Operating Mode DS DLL Mode Register Drive Strength An - A3 A2 - A0 Operating Mode A Drive Strength 1 0 Valid Normal Operation 0Normal All other states �� Reserved 1 Weak A 2 0 must be set to 0 A DLL 0 0 Enable 1 Disable * BA0 and BA1 must be 1, 0 to select the Extended Mode Register (vs. the base Mode Register) 2003-01-09, V1.1 Page 15 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Commands CommandsDeselect The Deselect function prevents new commands from being executed by the DDR SDRAM. The DDR SDRAM is effectively deselected. Operations already in progress are not affected. No Operation (NOP) The No Operation (NOP) command is used to perform a NOP to a DDR SDRAM. This prevents unwanted commands from being registered during idle or wait states. Operations already in progress are not affected. Mode Register Set The mode registers are loaded via inputs A0-A12, BA0 and BA1. See mode register descriptions in the Reg- ister Definition section. The Mode Register Set command can only be issued when all banks are idle and no bursts are in progress. A subsequent executable command cannot be issued until t is met. MRD Active The Active command is used to open (or activate) a row in a particular bank for a subsequent access. The value on the BA0, BA1 inputs selects the bank, and the address provided on inputs A0-A12 selects the row. This row remains active (or open) for accesses until a Precharge (or Read or Write with Auto Precharge) is issued to that bank. A Precharge (or Read or Write with Auto Precharge) command must be issued and com- pleted before opening a different row in the same bank. Read The Read command is used to initiate a burst read access to an active (open) row. The value on the BA0, BA1 inputs selects the bank, and the address provided on inputs A0-Ai, Aj (where [i = 8, j = don’t care] for x16, [i = 9, j = don’t care] for x8 and [i = 9, j = 11] for x4) selects the starting column location. The value on input A10 determines whether or not Auto Precharge is used. If Auto Precharge is selected, the row being accessed is precharged at the end of the Read burst; if Auto Precharge is not selected, the row remains open for subsequent accesses. Write The Write command is used to initiate a burst write access to an active (open) row. The value on the BA0, BA1 inputs selects the bank, and the address provided on inputs A0-Ai, Aj (where [i = 9, j = don’t care] for x8; where [i = 9, j = 11] for x4) selects the starting column location. The value on input A10 determines whether or not Auto Precharge is used. If Auto Precharge is selected, the row being accessed is precharged at the end of the Write burst; if Auto Precharge is not selected, the row remains open for subsequent accesses. Input data appearing on the DQs is written to the memory array subject to the DM input logic level appearing coin- cident with the data. If a given DM signal is registered low, the corresponding data is written to memory; if the DM signal is registered high, the corresponding data inputs are ignored, and a Write is not executed to that byte/column location. Precharge The Precharge command is used to deactivate (close) the open row in a particular bank or the open row(s) in all banks. The bank(s) will be available for a subsequent row access a specified time (t ) after the Precharge RP command is issued. Input A10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs BA0, BA1 select the bank. Otherwise BA0, BA1 are treated as “Don’t Care.” Once a bank has been precharged, it is in the idle state and must be activated prior to any 2003-01-09, V1.1 Page 16 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Read or Write commands being issued to that bank. A precharge command is treated as a NOP if there is no open row in that bank, or if the previously open row is already in the process of precharging. Auto Precharge Auto Precharge is a feature which performs the same individual-bank precharge functions described above, but without requiring an explicit command. This is accomplished by using A10 to enable Auto Precharge in conjunction with a specific Read or Write command. A precharge of the bank/row that is addressed with the Read or Write command is automatically performed upon completion of the Read or Write burst. Auto Pre- charge is nonpersistent in that it is either enabled or disabled for each individual Read or Write command. Auto Precharge ensures that the precharge is initiated at the earliest valid stage within a burst. The user must not issue another command to the same bank until the precharge (t ) is completed. This is determined as if RP an explicit Precharge command was issued at the earliest possible time, as described for each burst type in the Operation section of this data sheet. Burst Terminate The Burst Terminate command is used to truncate read bursts (with Auto Precharge disabled). The most re- cently registered Read command prior to the Burst Terminate command is truncated, as shown in the Opera- tion section of this data sheet. Auto Refresh Auto Refresh is used during normal operation of the DDR SDRAM and is analogous to CAS Before RAS (CBR) Refresh in previous DRAM types. This command is nonpersistent, so it must be issued each time a refresh is required. The refresh addressing is generated by the internal refresh controller. This makes the address bits “Don’t Care” during an Auto Refresh command. The 256Mb DDR SDRAM requires Auto Refresh cycles at an aver- age periodic interval of 7.8 �s (maximum). To allow for improved efficiency in scheduling and switching between tasks, some flexibility in the absolute refresh interval is provided. A maximum of eight Auto Refresh commands can be posted in the system, meaning that the maximum absolute interval between any Auto Refresh command and the next Auto Refresh command is 9 * 7.8 �s (70.2�s). This maximum absolute interval is short enough to allow for DLL updates internal to the DDR SDRAM to be restricted to Auto Refresh cycles, without allowing too much drift in t AC between updates. Self Refresh The Self Refresh command can be used to retain data in the DDR SDRAM, even if the rest of the system is powered down. When in the self refresh mode, the DDR SDRAM retains data without external clocking. The Self Refresh command is initiated as an Auto Refresh command coincident with CKE transitioning low. The DLL is automatically disabled upon entering Self Refresh, and is automatically enabled upon exiting Self Refresh (200 clock cycles must then occur before a Read command can be issued). Input signals except CKE (low) are “Don’t Care” during Self Refresh operation. The procedure for exiting self refresh requires a sequence of commands. CK (and CK) must be stable prior to CKE returning high. Once CKE is high, the SDRAM must have NOP commands issued for t because XSNR time is required for the completion of any internal refresh in progress. A simple algorithm for meeting both refresh and DLL requirements is to apply NOPs for 200 clock cycles before applying any other command. 2003-01-09, V1.1 Page 17 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Truth Table 1a: Commands Name (Function) CS RAS CAS WE Address MNE Notes Deselect (Nop) H X X X X NOP 1, 9 No Operation (Nop) L H H H X NOP 1, 9 Active (Select Bank And Activate Row) L L H H Bank/Row ACT 1, 3 Read (Select Bank And Column, And Start Read Burst) L H L H Bank/Col Read 1, 4 Write (Select Bank And Column, And Start Write Burst) L H L L Bank/Col Write 1, 4 Burst Terminate L H H L X BST 1, 8 Precharge (Deactivate Row In Bank Or Banks) L L H L Code PRE 1, 5 Auto Refresh Or Self Refresh (Enter Self Refresh Mode) L L L H X AR / SR 1, 6, 7 Mode Register Set L L L L Op-Code MRS 1, 2 1. CKE is HIGH for all commands shown except Self Refresh. 2. BA0, BA1 select either the Base or the Extended Mode Register (BA0 = 0, BA1 = 0 selects Mode Register; BA0 = 1, BA1 = 0 selects Extended Mode Register; other combinations of BA0-BA1 are reserved; A0-A12 provide the op-code to be written to the selected Mode Register.) 3. BA0-BA1 provide bank address and A0-A12 provide row address. 4. BA0, BA1 provide bank address; A0-Ai provide column address (where i = 8for x16, i = 9 for x8 and 9, 11 for x4); A10 HIGH enables the Auto Precharge feature (nonpersistent), A10 LOW disables the Auto Precharge feature. 5. A10 LOW: BA0, BA1 determine which bank is precharged. A10 HIGH: all banks are precharged and BA0, BA1 are “Don’t Care.” 6. This command is AUTO REFRESH if CKE is HIGH; Self Refresh if CKE is LOW. 7. Internal refresh counter controls row and bank addressing; all inputs and I/Os are “Don’t Care” except for CKE. 8. Applies only to read bursts with Auto Precharge disabled; this command is undefined (and should not be used) for read bursts with Auto Precharge enabled or for write bursts 9. Deselect and NOP are functionally interchangeable. Truth Table 1b: DM Operation Name (Function) DM DQs Notes Write Enable L Valid 1 Write Inhibit H X 1 1. Used to mask write data; provided coincident with the corresponding data. 2003-01-09, V1.1 Page 18 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Operations Bank/Row Activation Before any Read or Write commands can be issued to a bank within the DDR SDRAM, a row in that bank must be “opened” (activated). This is accomplished via the Active command and addresses A0-A12, BA0 and BA1 (see Activating a Specific Row in a Specific Bank), which decode and select both the bank and the row to be activated. After opening a row (issuing an Active command), a Read or Write command may be issued to that row, subject to the t specification. A subsequent Active command to a different row in the same RCD bank can only be issued after the previous active row has been “closed” (precharged). The minimum time interval between successive Active commands to the same bank is defined by t . A subsequent Active com- RC mand to another bank can be issued while the first bank is being accessed, which results in a reduction of total row-access overhead. The minimum time interval between successive Active commands to different banks is defined by t . RRD Activating a Specific Row in a Specific Bank CK CK HIGH CKE CS RAS CAS WE RA = row address. RA A0-A12 BA = bank address. BA BA0, BA1 Don’t Care 2003-01-09, V1.1 Page 19 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B t and t Definition RCD RRD CK CK RD/WR ACT NOP ACT NOP NOP RD/WR NOP NOP Command ROW ROW COL A0-A12 BA x BA y BA y BA0, BA1 t t RRD RCD Don’t Care Reads Subsequent to programming the mode register with CAS latency, burst type, and burst length, Read bursts are initiated with a Read command, as shown on Read Command on page 21. The starting column and bank addresses are provided with the Read command and Auto Precharge is either enabled or disabled for that burst access. If Auto Precharge is enabled, the row that is accessed starts pre- charge at the completion of the burst, provided t has been satisfied. For the generic Read commands RAS used in the following illustrations, Auto Precharge is disabled. During Read bursts, the valid data-out element from the starting column address is available following the CAS latency after the Read command. Each subsequent data-out element is valid nominally at the next posi- tive or negative clock edge (i.e. at the next crossing of CK and CK). Read Burst: CAS Latencies (Burst Length = 4) on page 22 shows general timing for each supported CAS latency setting. DQS is driven by the DDR SDRAM along with output data. The initial low state on DQS is known as the read preamble; the low state coincident with the last data-out element is known as the read postamble. Upon completion of a burst, assuming no other commands have been initiated, the DQs goes High-Z. Data from any Read burst may be concatenated with or truncated with data from a subsequent Read command. In either case, a continuous flow of data can be maintained. The first data element from the new burst follows either the last element of a completed burst or the last desired data element of a longer burst which is being truncated. The new Read command should be issued x cycles after the first Read command, where x equals the number of desired data element pairs (pairs are required by the 2n prefetch architecture). This is shown on Consecutive Read Bursts: CAS Latencies (Burst Length = 4 or 8) on page 23. A Read command can be initiated on any clock cycle following a previous Read command. Nonconsecutive Read data is illustrated on Non-Consecutive Read Bursts: CAS Latencies (Burst Length = 4) on page 24. Full-speed Random Read Accesses: CAS Latencies (Burst Length = 2, 4 or 8) within a page (or pages) can be performed as shown on page 25. 2003-01-09, V1.1 Page 20 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Read Command CK CK HIGH CKE CS RAS CAS WE x4: A0-A9, A11 CA x8: A0-A9 x16: A0-A8 EN AP A10 DIS AP CA = column address BA = bank address BA0, BA1 BA EN AP = enable Auto Precharge DIS AP = disable Auto Precharge Don’t Care 2003-01-09, V1.1 Page 21 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Read Burst: CAS Latencies (Burst Length = 4) CAS Latency = 2 CK CK Read NOP NOP NOP NOP NOP Command BA a,COL n Address CL=2 DQS DOa-n DQ CAS Latency = 2.5 CK CK Read NOP NOP NOP NOP NOP Command BA a,COL n Address CL=2.5 DQS DOa-n DQ Don’t Care DO a-n = data out from bank a, column n. 3 subsequent elements of data out appear in the programmed order following DO a-n. Shown with nominal t , t , and t . AC DQSCK DQSQ 2003-01-09, V1.1 Page 22 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Consecutive Read Bursts: CAS Latencies (Burst Length = 4 or 8) CAS Latency = 2 CK CK Read NOP Read NOP NOP NOP Command BAa, COL n BAa, COL b Address CL=2 DQS DOa-n DOa-b DQ CAS Latency = 2.5 CK CK Read NOP Read NOP NOP NOP Command BAa, COL n BAa,COL b Address CL=2.5 DQS DOa- n DOa- b DQ DO a-n (or a-b) = data out from bank a, column n (or bank a, column b). When burst length = 4, the bursts are concatenated. Don’t Care When burst length = 8, the second burst interrupts the first. 3 subsequent elements of data out appear in the programmed order following DO a-n. 3 (or 7) subsequent elements of data out appear in the programmed order following DO a-b. Shown with nominal t , t , and t . AC DQSCK DQSQ 2003-01-09, V1.1 Page 23 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Non-Consecutive Read Bursts: CAS Latencies (Burst Length = 4) CAS Latency = 2 CK CK Read NOP NOP Read NOP NOP Command BAa, COL n BAa, COL b Address CL=2 DQS DO a-n DOa- b DQ CAS Latency = 2.5 CK CK Read NOP NOP Read NOP NOP NOP Command BAa, COL n BAa, COL b Address CL=2.5 DQS DO a-n DOa- b DQ DO a-n (or a-b) = data out from bank a, column n (or bank a, column b). 3 subsequent elements of data out appear in the programmed order following DO a-n (and following DO a-b). Shown with nominal t , t , and t . AC DQSCK DQSQ Don’t Care 2003-01-09, V1.1 Page 24 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Random Read Accesses: CAS Latencies (Burst Length = 2, 4 or 8) CAS Latency = 2 CK CK Read Read Read Read NOP NOP Command BAa, COL n BAa, COL x BAa, COL b BAa, COL g Address CL=2 DQS DOa-n DOa-n' DOa-x DOa-x' DOa-b DOa-b’ DOa-g DQ CAS Latency = 2.5 CK CK Read Read Read Read NOP NOP Command Address BAa, COL n BAa, COL x BAa, COL b BAa, COL g CL=2.5 DQS DOa-n DOa-n' DOa-x DOa-x' DOa-b DOa-b’ DQ DO a-n, etc. = data out from bank a, column n etc. Don’t Care n' etc. = odd or even complement of n, etc. (i.e., column address LSB inverted). Reads are to active rows in any banks. Shown with nominal t , t , and t . AC DQSCK DQSQ 2003-01-09, V1.1 Page 25 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Data from any Read burst may be truncated with a Burst Terminate command, as shown on Terminating a Read Burst: CAS Latencies (Burst Length = 8) on page 27. The Burst Terminate latency is equal to the read (CAS) latency, i.e. the Burst Terminate command should be issued x cycles after the Read command, where x equals the number of desired data element pairs. Data from any Read burst must be completed or truncated before a subsequent Write command can be issued. If truncation is necessary, the Burst Terminate command must be used, as shown on Read to Write: CAS Latencies (Burst Length = 4 or 8) on page 28. The example is shown for t (min). The t (max) DQSS DQSS case, not shown here, has a longer bus idle time. t (min) and t (max) are defined in the section on DQSS DQSS Writes. A Read burst may be followed by, or truncated with, a Precharge command to the same bank (provided that Auto Precharge was not activated). The Precharge command should be issued x cycles after the Read com- mand, where x equals the number of desired data element pairs (pairs are required by the 2n prefetch archi- tecture). This is shown on Read to Precharge: CAS Latencies (Burst Length = 4 or 8) on page 29 for Read latencies of 2 and 2.5. Following the Precharge command, a subsequent command to the same bank cannot be issued until t is met. Note that part of the row precharge time is hidden during the access of the last data RP elements. In the case of a Read being executed to completion, a Precharge command issued at the optimum time (as described above) provides the same operation that would result from the same Read burst with Auto Pre- charge enabled. The disadvantage of the Precharge command is that it requires that the command and address busses be available at the appropriate time to issue the command. The advantage of the Precharge command is that it can be used to truncate bursts. 2003-01-09, V1.1 Page 26 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Terminating a Read Burst: CAS Latencies (Burst Length = 8) CAS Latency = 2 CK CK Read NOP BST NOP NOP NOP Command BAa, COL n Address CL=2 DQS DOa-n DQ No further output data after this point. DQS tristated. CAS Latency = 2.5 CK CK Read NOP BST NOP NOP NOP Command BAa, COL n Address CL=2.5 DQS DOa-n DQ No further output data after this point. DQS tristated. DO a-n = data out from bank a, column n. Cases shown are bursts of 8 terminated after 4 data elements. 3 subsequent elements of data out appear in the programmed order following DO a-n. Don’t Care Shown with nominal t , t , and t . AC DQSCK DQSQ 2003-01-09, V1.1 Page 27 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Read to Write: CAS Latencies (Burst Length = 4 or 8) CAS Latency = 2 CK CK Read BST NOP Write NOP NOP Command BAa, COL n BAa, COL b Address CL=2 t (min) DQSS DQS DI a-b DQ DOa-n DM CAS Latency = 2.5 CK CK Read BST NOP NOP Write NOP Command BAa, COL n BAa, COL b Address CL=2.5 t (min) DQSS DQS DOa-n Dla-b DQ DM DO a-n = data out from bank a, column n . DI a-b = data in to bank a, column b 1 subsequent elements of data out appear in the programmed order following DO a-n. Data In elements are applied following Dl a-b in the programmed order, according to burst length. Shown with nominal t , t , and t . Don’t Care AC DQSCK DQSQ 2003-01-09, V1.1 Page 28 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Read to Precharge: CAS Latencies (Burst Length = 4 or 8) CAS Latency = 2 CK CK Read NOP PRE NOP NOP ACT Command t RP BA a, COL n BA a or all BA a, ROW Address CL=2 DQS DOa-n DQ CAS Latency = 2.5 CK CK Read NOP PRE NOP NOP ACT Command t RP BA a or all BA a, COL n BA a, ROW Address CL=2.5 DQS DOa-n DQ DO a-n = data out from bank a, column n. Cases shown are either uninterrupted bursts of 4 or interrupted bursts of 8. 3 subsequent elements of data out appear in the programmed order following DO a-n. Shown with nominal t , t , and t . AC DQSCK DQSQ Don’t Care 2003-01-09, V1.1 Page 29 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Writes Write bursts are initiated with a Write command, as shown on Write Command on page 31. The starting column and bank addresses are provided with the Write command, and Auto Precharge is either enabled or disabled for that access. If Auto Precharge is enabled, the row being accessed is precharged at the completion of the burst. For the generic Write commands used in the following illustrations, Auto Pre- charge is disabled. During Write bursts, the first valid data-in element is registered on the first rising edge of DQS following the write command, and subsequent data elements are registered on successive edges of DQS. The Low state on DQS between the Write command and the first rising edge is known as the write preamble; the Low state on DQS following the last data-in element is known as the write postamble. The time between the Write com- mand and the first corresponding rising edge of DQS (t ) is specified with a relatively wide range (from DQSS 75% to 125% of one clock cycle), so most of the Write diagrams that follow are drawn for the two extreme cases (i.e. t (min) and t (max)). Write Burst (Burst Length = 4) on page 32 shows the two extremes of DQSS DQSS t for a burst of four. Upon completion of a burst, assuming no other commands have been initiated, the DQSS DQs and DQS enters High-Z and any additional input data is ignored. Data for any Write burst may be concatenated with or truncated with a subsequent Write command. In either case, a continuous flow of input data can be maintained. The new Write command can be issued on any pos- itive edge of clock following the previous Write command. The first data element from the new burst is applied after either the last element of a completed burst or the last desired data element of a longer burst which is being truncated. The new Write command should be issued x cycles after the first Write command, where x equals the number of desired data element pairs (pairs are required by the 2n prefetch architecture). Write to Write (Burst Length = 4) on page 33 shows concatenated bursts of 4. An example of non-consecutive Writes is shown on Write to Write: Max DQSS, Non-Consecutive (Burst Length = 4) on page 34. Full-speed random write accesses within a page or pages can be performed as shown on Random Write Cycles (Burst Length = 2, 4 or 8) on page 35. Data for any Write burst may be followed by a subsequent Read command. To follow a Write without truncating the write burst, t (Write to Read) should be met as shown on Write to Read: Non- WTR Interrupting (CAS Latency = 2; Burst Length = 4) on page 36. Data for any Write burst may be truncated by a subsequent Read command, as shown in the figures on Write to Read: Interrupting (CAS Latency = 2; Burst Length = 8) on page 37 to Write to Read: Nominal DQSS, Inter- rupting (CAS Latency = 2; Burst Length = 8) on page 39. Note that only the data-in pairs that are registered prior to the t period are written to the internal array, and any subsequent data-in must be masked with WTR DM, as shown in the diagrams noted previously. Data for any Write burst may be followed by a subsequent Precharge command. To follow a Write without truncating the write burst, t should be met as shown on Write to Precharge: Non-Interrupting (Burst Length WR = 4) on page 40. Data for any Write burst may be truncated by a subsequent Precharge command, as shown in the figures on Write to Precharge: Interrupting (Burst Length = 4 or 8) on page 41 to Write to Precharge: Nominal DQSS (2 bit Write), Interrupting (Burst Length = 4 or 8) on page 43. Note that only the data-in pairs that are registered prior to the t period are written to the internal array, and any subsequent data in should be masked with WR DM. Following the Precharge command, a subsequent command to the same bank cannot be issued until t RP is met. In the case of a Write burst being executed to completion, a Precharge command issued at the optimum time (as described above) provides the same operation that would result from the same burst with Auto Pre- charge. The disadvantage of the Precharge command is that it requires that the command and address bus- ses be available at the appropriate time to issue the command. The advantage of the Precharge command is that it can be used to truncate bursts. 2003-01-09, V1.1 Page 30 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write Command CK CK HIGH CKE CS RAS CAS WE x4: A0-A9, A11 x8: A0-A9 CA x16: A0-A8 EN AP A10 DIS AP CA = column address BA = bank address BA0, BA1 BA EN AP = enable Auto Precharge DIS AP = disable Auto Precharge Don’t Care 2003-01-09, V1.1 Page 31 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write Burst (Burst Length = 4) Maximum DQSS T1 T2 T3 T4 CK CK Write NOP NOP NOP Command BA a, COL b Address t (max) DQSS DQS Dla-b DQ DM Minimum DQSS T1 T2 T3 T4 CK CK Write NOP NOP NOP Command BA a, COL b Address t (min) DQSS DQS Dla-b DQ DM DI a-b = data in for bank a, column b. 3 subsequent elements of data in are applied in the programmed order following DI a-b. A non-interrupted burst is shown. A10 is Low with the Write command (Auto Precharge is disabled). Don’t Care 2003-01-09, V1.1 Page 32 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write to Write (Burst Length = 4) Maximum DQSS T1 T2 T3 T4 T5 T6 CK CK Write NOP Write NOP NOP NOP Command BAa, COL b BAa, COL n Address t (max) DQSS DQS DI a-b DI a-n DQ DM Minimum DQSS T1 T2 T3 T4 T5 T6 CK CK Write NOP Write NOP NOP NOP Command BA, COL b BA, COL n Address t (min) DQSS DQS DI a-b DI a-n DQ DM DI a-b = data in for bank a, column b, etc. 3 subsequent elements of data in are applied in the programmed order following DI a-b. 3 subsequent elements of data in are applied in the programmed order following DI a-n. A non-interrupted burst is shown. Don’t Care Each Write command may be to any bank. 2003-01-09, V1.1 Page 33 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write to Write: Max DQSS, Non-Consecutive (Burst Length = 4) T1 T2 T3 T4 T5 CK CK Write NOP NOP Write NOP Command BAa, COL b Address BAa, COL n t (max) DQSS DQS DI a-b DI a-n DQ DM DI a-b, etc. = data in for bank a, column b, etc. 3 subsequent elements of data in are applied in the programmed order following DI a-b. 3 subsequent elements of data in are applied in the programmed order following DI a-n. A non-interrupted burst is shown. Don’t Care Each Write command may be to any bank. 2003-01-09, V1.1 Page 34 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Random Write Cycles (Burst Length = 2, 4 or 8) Maximum DQSS T1 T2 T3 T4 T5 CK CK Write Write Write Write Write Command BAa, COL b BAa, COL x BAa, COL n BAa, COL a BAa, COL g Address t (max) DQSS DQS DI a-b DI a-b’ DI a-x DI a-x’ DI a-n DI a-n’ DI a-a DI a-a’ DQ DM Minimum DQSS T1 T2 T3 T4 T5 CK CK Write Write Write Write Write Command BAa, COL b BAa, COL x BAa, COL n BAa, COL a BAa, COL g Address t (min) DQSS DQS DI a-g DI a-b DI a-b’ DI a-x DI a-x’ DI a-n DI a-n’ DI a-a DI a-a’ DQ DM DI a-b, etc. = data in for bank a, column b, etc. b', etc. = odd or even complement of b, etc. (i.e., column address LSB inverted). Don’t Care Each Write command may be to any bank. 2003-01-09, V1.1 Page 35 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write to Read: Non-Interrupting (CAS Latency = 2; Burst Length = 4) Maximum DQSS T1 T2 T3 T4 T5 T6 CK CK Write NOP NOP NOP Read NOP Command t WTR BAa, COL b BAa, COL n Address CL = 2 t (max) DQSS DQS DI a-b DQ DM Minimum DQSS T1 T2 T3 T4 T5 T6 CK CK Write NOP NOP NOP Read NOP Command t WTR BAa, COL n BAa, COL b Address CL = 2 t (min) DQSS DQS DI a-b DQ DM DI a-b = data in for bank a, column b. 3 subsequent elements of data in are applied in the programmed order following DI a-b. A non-interrupted burst is shown. t is referenced from the first positive CK edge after the last data in pair. WTR A10 is Low with the Write command (Auto Precharge is disabled). Don’t Care The Read and Write commands may be to any bank. 2003-01-09, V1.1 Page 36 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write to Read: Interrupting (CAS Latency = 2; Burst Length = 8) Maximum DQSS T1 T2 T3 T4 T5 T6 CK CK Write NOP NOP NOP Read NOP Command t WTR BAa, COL b BAa, COL n Address CL = 2 t (max) DQSS DQS DIa- b DQ DM 11 Minimum DQSS T1 T2 T3 T4 T5 T6 CK CK Write NOP NOP NOP Read NOP Command t WTR BAa, COL b BAa, COL n Address CL = 2 t (min) DQSS DQS DI a-b DQ DM 11 DI a-b = data in for bank a, column b. An interrupted burst is shown, 4 data elements are written. 3 subsequent elements of data in are applied in the programmed order following DI a-b. t is referenced from the first positive CK edge after the last data in pair. WTR The Read command masks the last 2 data elements in the burst. A10 is Low with the Write command (Auto Precharge is disabled). The Read and Write commands are not necessarily to the same bank. Don’t Care 1 = These bits are incorrectly written into the memory array if DM is low. 2003-01-09, V1.1 Page 37 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write to Read: Minimum DQSS, Odd Number of Data (3 bit Write), Interrupting (CAS Latency = 2; Burst Length = 8) T1 T2 T3 T4 T5 T6 CK CK Write NOP NOP NOP Read NOP Command t WTR BAa, COL b BAa, COL n Address CL = 2 t (min) DQSS DQS DI a-b DQ 12 2 DM DI a-b = data in for bank a, column b. An interrupted burst is shown, 3 data elements are written. 2 subsequent elements of data in are applied in the programmed order following DI a-b. t is referenced from the first positive CK edge after the last desired data in pair (not the last desired data in element) WTR The Read command masks the last 2 data elements in the burst. A10 is Low with the Write command (Auto Precharge is disabled). The Read and Write commands are not necessarily to the same bank. 1 = This bit is correctly written into the memory array if DM is low. Don’t Care 2 = These bits are incorrectly written into the memory array if DM is low. 2003-01-09, V1.1 Page 38 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write to Read: Nominal DQSS, Interrupting (CAS Latency = 2; Burst Length = 8) T1 T2 T3 T4 T5 T6 CK CK Write NOP NOP NOP Read NOP Command t WTR BAa, COL b BAa, COL n Address CL = 2 t (nom) DQSS DQS DI a-b DQ DM 1 1 DI a-b = data in for bank a, column b. An interrupted burst is shown, 4 data elements are written. 3 subsequent elements of data in are applied in the programmed order following DI a-b. t is referenced from the first positive CK edge after the last desired data in pair. WTR The Read command masks the last 2 data elements in the burst. A10 is Low with the Write command (Auto Precharge is disabled). The Read and Write commands are not necessarily to the same bank. Don’t Care 1 = These bits are incorrectly written into the memory array if DM is low. 2003-01-09, V1.1 Page 39 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write to Precharge: Non-Interrupting (Burst Length = 4) Maximum DQSS T1 T2 T3 T4 T5 T6 CK CK Write NOP NOP NOP NOP PRE Command t WR BA (a or all) BA a, COL b Address t t (max) RP DQSS DQS DI a-b DQ DM Minimum DQSS T1 T2 T3 T4 T5 T6 CK CK Write NOP NOP NOP NOP PRE Command t WR BA a, COL b BA (a or all) Address t RP t (min) DQSS DQS DI a-b DQ DM DI a-b = data in for bank a, column b. 3 subsequent elements of data in are applied in the programmed order following DI a-b. A non-interrupted burst is shown. t is referenced from the first positive CK edge after the last data in pair. WR Don’t Care A10 is Low with the Write command (Auto Precharge is disabled). 2003-01-09, V1.1 Page 40 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write to Precharge: Interrupting (Burst Length = 4 or 8) Maximum DQSS T1 T2 T3 T4 T5 T6 CK CK Write NOP NOP NOP PRE NOP Command t WR BA a, COL b BA (a or all) Address t t (max) RP DQSS 2 DQS DI a-b DQ 11 DM 3 3 Minimum DQSS T1 T2 T3 T4 T5 T6 CK CK Write NOP NOP NOP PRE NOP Command t WR BA a, COL b BA (a or all) Address t t (min) RP 2 DQSS DQS DI a-b DQ 3 3 11 DM DI a-b = data in for bank a, column b. An interrupted burst is shown, 2 data elements are written. 1 subsequent element of data in is applied in the programmed order following DI a-b. t is referenced from the first positive CK edge after the last desired data in pair. WR The Precharge command masks the last 2 data elements in the burst, for burst length = 8. A10 is Low with the Write command (Auto Precharge is disabled). 1 = Can be don't care for programmed burst length of 4. 2 = For programmed burst length of 4, DQS becomes don't care at this point. Don’t Care 3 = These bits are incorrectly written into the memory array if DM is low. 2003-01-09, V1.1 Page 41 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write to Precharge: Minimum DQSS, Odd Number of Data (1 bit Write), Interrupting (Burst Length = 4 or 8) T1 T2 T3 T4 T5 T6 CK CK Write NOP NOP NOP PRE NOP Command t WR BA a, COL b BA (a or all) Address t t (min) 2 RP DQSS DQS DI a-b DQ 11 34 4 DM DI a-b = data in for bank a, column b. An interrupted burst is shown, 1 data element is written. t is referenced from the first positive CK edge after the last desired data in pair. WR The Precharge command masks the last 2 data elements in the burst. A10 is Low with the Write command (Auto Precharge is disabled). 1 = Can be don't care for programmed burst length of 4. 2 = For programmed burst length of 4, DQS becomes don't care at this point. 3 = This bit is correctly written into the memory array if DM is low. Don’t Care 4 = These bits are incorrectly written into the memory array if DM is low. 2003-01-09, V1.1 Page 42 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write to Precharge: Nominal DQSS (2 bit Write), Interrupting (Burst Length = 4 or 8) T1 T2 T3 T4 T5 T6 CK CK Write NOP NOP NOP PRE NOP Command t WR BA a, COL b BA (a or all) Address t t (nom) RP DQSS 2 DQS DI a-b DQ 3 3 1 1 DM DI a-b = Data In for bank a, column b. An interrupted burst is shown, 2 data elements are written. 1 subsequent element of data in is applied in the programmed order following DI a-b. t is referenced from the first positive CK edge after the last desired data in pair. WR The Precharge command masks the last 2 data elements in the burst. A10 is Low with the Write command (Auto Precharge is disabled). 1 = Can be don't care for programmed burst length of 4. 2 = For programmed burst length of 4, DQS becomes don't care at this point. Don’t Care 3 = These bits are incorrectly written into the memory array if DM is low. 2003-01-09, V1.1 Page 43 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Precharge Command CK CK HIGH CKE CS RAS CAS WE A0-A9, A11, A12 All Banks A10 One Bank BA BA0, BA1 BA = bank address (if A10 is Low, otherwise Don’t Care). Don’t Care Precharge The Precharge command is used to deactivate the open row in a particular bank or the open row in all banks. The bank(s) is available for a subsequent row access some specified time (t ) after the Precharge com- RP mand is issued. Input A10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs BA0, BA1 select the bank. When all banks are to be precharged, inputs BA0, BA1 are treated as “Don’t Care.” Once a bank has been precharged, it is in the idle state and must be activated prior to any Read or Write commands being issued to that bank. 2003-01-09, V1.1 Page 44 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Power-Down Power-down is entered when CKE is registered LOW (no accesses can be in progress). If power-down occurs when all banks are idle, this mode is referred to as precharge power-down; if power-down occurs when there is a row active in any bank, this mode is referred to as active power-down. Entering power-down deactivates the input and output buffers, excluding CK, CK and CKE. The DLL is still running in Power Down mode, so for maximum power savings, the user has the option of disabling the DLL prior to entering Power- down. In that case, the DLL must be enabled after exiting power-down, and 200 clock cycles must occur before a Read command can be issued. In power-down mode, CKE Low and a stable clock signal must be maintained at the inputs of the DDR SDRAM, and all other input signals are “Don’t Care”. However, power- down duration is limited by the refresh requirements of the device, so in most applications, the self refresh mode is preferred over the DLL-disabled power-down mode. The power-down state is synchronously exited when CKE is registered HIGH (along with a Nop or Deselect command). A valid, executable command may be applied one clock cycle later. Power Down CK CK t t IS IS CKE Command VALID NOP NOP VALID No column Exit access in power down progress mode Don’t Care Enter Power Down mode (Burst Read or Write operation must not be in progress) 2003-01-09, V1.1 Page 45 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Truth Table 2: Clock Enable (CKE) 1. CKEn is the logic state of CKE at clock edge n: CKE n-1 was the state of CKE at the previous clock edge. 2. Current state is the state of the DDR SDRAM immediately prior to clock edge n. 3. COMMAND n is the command registered at clock edge n, and ACTION n is a result of COMMAND n. 4. All states and sequences not shown are illegal or reserved. CKE n-1 CKEn Current State Command n Action n Notes Previous Current Cycle Cycle Self Refresh L L X Maintain Self-Refresh Self Refresh L H Deselect or NOP Exit Self-Refresh 1 Power Down L L X Maintain Power-Down Power Down L H Deselect or NOP Exit Power-Down All Banks Idle H L Deselect or NOP Precharge Power-Down Entry All Banks Idle H L AUTO REFRESH Self Refresh Entry Bank(s) Active H L Deselect or NOP Active Power-Down Entry See “Truth Table 3: Current State HH Bank n - Command to Bank n (Same Bank)” on page 47 1. Deselect or NOP commands should be issued on any clock edges occurring during the Self Refresh Exit (t ) period. A mini- XSNR mum of 200 clock cycles are needed before applying a read command to allow the DLL to lock to the input clock. 2003-01-09, V1.1 Page 46 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Truth Table 3: Current State Bank n - Command to Bank n (Same Bank) Current State CS RAS CAS WE Command Action Notes H X X X Deselect NOP. Continue previous operation 1-6 Any L H H H No Operation NOP. Continue previous operation 1-6 L L H H Active Select and activate row 1-6 Idle L L L H AUTO REFRESH 1-7 LL LL MODE REGISTER SET 1-7 L H L H Read Select column and start Read burst 1-6, 10 Row Active L H L L Write Select column and start Write burst 1-6, 10 L L H L Precharge Deactivate row in bank(s) 1-6, 8 L H L H Read Select column and start new Read burst 1-6, 10 Read (Auto Precharge L L H L Precharge Truncate Read burst, start Precharge 1-6, 8 Disabled) L H H L BURST TERMINATE BURST TERMINATE 1-6, 9 L H L H Read Select column and start Read burst 1-6, 10, 11 Write (Auto Precharge L H L L Write Select column and start Write burst 1-6, 10 Disabled) L L H L Precharge Truncate Write burst, start Precharge 1-6, 8, 11 1. This table applies when CKE n-1 was HIGH and CKE n is HIGH (see Truth Table 2: Clock Enable (CKE) and after t t XSNR / XSRD has been met (if the previous state was self refresh). 2. This table is bank-specific, except where noted, i.e., the current state is for a specific bank and the commands shown are those allowed to be issued to that bank when in that state. Exceptions are covered in the notes below. 3. Current state definitions: Idle: The bank has been precharged, and t has been met. RP Row Active: A row in the bank has been activated, and t has been met. No data bursts/accesses and no register RCD accesses are in progress. Read: A Read burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated. Write: A Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated. 4. The following states must not be interrupted by a command issued to the same bank. Precharging: Starts with registration of a Precharge command and ends when t is met. Once t is met, the bank is in the RP RP idle state. Row Activating: Starts with registration of an Active command and ends when t is met. Once t is met, the bank is in the RCD RCD “row active” state. Read w/Auto Precharge Enabled: Starts with registration of a Read command with Auto Precharge enabled and ends when t RP has been met. Once t is met, the bank is in the idle state. RP Write w/Auto Precharge Enabled: Starts with registration of a Write command with Auto Precharge enabled and ends when t RP has been met. Once t is met, the bank is in the idle state. RP Deselect or NOP commands, or allowable commands to the other bank should be issued on any clock edge occurring during these states. Allowable commands to the other bank are determined by its current state and according Truth Table 4. 5. The following states must not be interrupted by any executable command; Deselect or NOP commands must be applied on each positive clock edge during these states. Refreshing: Starts with registration of an Auto Refresh command and ends when t is met. Once t is met, the DDR RFC RFC SDRAM is in the “all banks idle” state. Accessing Mode Register: Starts with registration of a Mode Register Set command and ends when t has been met. Once MRD t is met, the DDR SDRAM is in the “all banks idle” state. MRD Precharging All: Starts with registration of a Precharge All command and ends when t is met. Once t is met, all banks is in RP RP the idle state. 6. All states and sequences not shown are illegal or reserved. 7. Not bank-specific; requires that all banks are idle. 8. May or may not be bank-specific; if all/any banks are to be precharged, all/any must be in a valid state for precharging. 9. Not bank-specific; BURST TERMINATE affects the most recent Read burst, regardless of bank. 10. Reads or Writes listed in the Command/Action column include Reads or Writes with Auto Precharge enabled and Reads or Writes with Auto Precharge disabled. 11. Requires appropriate DM masking. 2003-01-09, V1.1 Page 47 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Truth Table 4: Current State Bank n - Command to Bank m (Different bank) Current State CS RAS CAS WE Command Action Notes H X X X Deselect NOP/continue previous operation 1-6 Any L H H H No Operation NOP/continue previous operation 1-6 Any Command Otherwise Idle XX XX 1-6 Allowed to Bank m L L H H Active Select and activate row 1-6 Row Activating, L H L H Read Select column and start Read burst 1-7 Active, or L H L L Write Select column and start Write burst 1-7 Precharging L L H L Precharge 1-6 L L H H Active Select and activate row 1-6 Read (Auto Precharge L H L H Read Select column and start new Read burst 1-7 Disabled) L L H L Precharge 1-6 L L H H Active Select and activate row 1-6 Write L H L H Read Select column and start Read burst 1-8 (Auto Precharge L H L L Write Select column and start new Write burst 1-7 Disabled) L L H L Precharge 1-6 L L H H Active Select and activate row 1-6 L H L H Read Select column and start new Read burst 1-7,10 Read (With Auto Precharge) L H L L Write Select column and start Write burst 1-7,9,10 L L H L Precharge 1-6 L L H H Active Select and activate row 1-6 L H L H Read Select column and start Read burst 1-7,10 Write (With Auto Precharge) L H L L Write Select column and start new Write burst 1-7,10 L L H L Precharge 1-6 1. This table applies when CKE n-1 was HIGH and CKE n is HIGH (see Truth Table 2: Clock Enable (CKE) and after t t XSNR / XSRD has been met (if the previous state was self refresh). 2. This table describes alternate bank operation, except where noted, i.e., the current state is for bank n and the commands shown are those allowed to be issued to bank m (assuming that bank m is in such a state that the given command is allowable). Excep- tions are covered in the notes below. 3. Current state definitions: Idle: The bank has been precharged, and t has been met. RP Row Active: A row in the bank has been activated, and t has been met. No data bursts/accesses and no register RCD accesses are in progress. Read: A Read burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated. Write: A Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated. Read with Auto Precharge Enabled: See note 10. Write with Auto Precharge Enabled: See note 10. 4. AUTO REFRESH and Mode Register Set commands may only be issued when all banks are idle. 5. A BURST TERMINATE command cannot be issued to another bank; it applies to the bank represented by the current state only. 6. All states and sequences not shown are illegal or reserved. 7. Reads or Writes listed in the Command/Action column include Reads or Writes with Auto Precharge enabled and Reads or Writes with Auto Precharge disabled. 8. Requires appropriate DM masking. 9. A Write command may be applied after the completion of data output. 10. Concurrent Auto Precharge: This device supports “Concurrent Auto Precharge”. When a read with auto precharge or a write with auto precharge is enabled any command may follow to the other banks as long as that command does not interrupt the read or write data transfer and all other limitations apply (e.g. contention between READ data and WRITE data must be avoided). The mimimum delay from a read or write command with auto precharge enable, to a command to a different banks is summarized in table 5. 2003-01-09, V1.1 Page 48 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Truth Table 5: Concurrent Auto Precharge Minimum Delay with Con- To Command From Command current Auto Precharge Units (different bank) Support Read or Read w/AP 1 + (BL/2) + tWTR tCK WRITE w/AP Write ot Write w/AP BL/2 tCK Precharge or Activate 1 tCK Read or Read w/AP BL/2 tCK Read w/AP Write or Write w/AP CL (rounded up)+ BL/2 tCK Precharge or Activate 1 tCK 2003-01-09, V1.1 Page 49 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Simplified State Diagram Power Applied Power On Self Precharge Refresh PREALL REFS REFSX MRS Auto MRS REFA Idle EMRS Refresh CKEL CKEH Active ACT Power Precharge Down Power Down CKEH CKEL Burst Stop Row Active Read Write Write A Read A Write Read Read Write A Read A Read A PRE Write Read A A PRE PRE Precharge PRE PREALL Automatic Sequence Command Sequence PREALL = Precharge All Banks CKEL = Enter Power Down MRS = Mode Register Set CKEH = Exit Power Down EMRS = Extended Mode Register Set ACT = Active REFS = Enter Self Refresh Write A = Write with Autoprecharge REFSX = Exit Self Refresh Read A = Read with Autoprecharge REFA = Auto Refresh PRE = Precharge 2003-01-09, V1.1 Page 50 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Operating Conditions Absolute Maximum Ratings Symbol Parameter Rating Units V , V Voltage on I/O pins relative to V �0.5 to V ��0.5 V IN OUT SS DDQ V Voltage on Inputs relative to V �0.5 to �3.6 V IN SS V DD Voltage on V supply relative to V �0.5 to �3.6 V DD SS V Voltage on V supply relative to V �0.5 to �3.6 V DDQ DDQ SS T Operating Temperature (Ambient) 0 to �70 �C A T Storage Temperature (Plastic) �55 to �150 �C STG P Power Dissipation 1.0 W D I Short Circuit Output Current 50 mA OUT Note: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at these or any other conditions above those indicated in the operational sec- tions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Input and Output Capacitances Parameter Package Symbol Min. Max. Units Notes TSOP 2.0 3.0 Input Capacitance: CK, CK C pF 1 I1 BGA 1.5 2.5 TSOP -0.25 Delta Input Capacitance CK, CK C pF 1 dI1 BGA - 0.25 TSOP 2.0 3.0 Input Capacitance: All other input-only pins C pF 1 I2 BGA 1.5 2.5 TSOP -0.5 Delta Input Capacitance: All other input-only pins C pF 1 dI2 BGA - 0.5 TSOP 4.0 5.0 Input/Output Capacitance: DQ, DQS, DM C pF 1, 2 IO BGA 3.5 4.5 TSOP -0.5 Delta Input/Output Capacitance : DQ, DQS, DM C pF 1 dIO BGA - 0.5 1. These values are guaranteed by design and are tested on a sample base only. V = V = 2.5V ± 0.2V, f = 100MHz, T = 25�C, DDQ DD A V (DC) = V , VOUT (Peak to Peak) 0.2V. Unused pins are tied to ground . OUT DDQ/2 2. DM inputs are grouped with I/O pins reflecting the fact that they are matched in loading to DQ and DQS to facilitate trace matching at the board level 2003-01-09, V1.1 Page 51 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Electrical Characteristics and DC Operating Conditions (0°C � T ���70�C; V = 2.5V ��0.2V, V = ��2.5V ��0.2V ) A DDQ DD Symbol Parameter Min Max Units Notes V Supply Voltage 2.3 2.7 V 1 DD V I/O Supply Voltage 2.3 2.7 V 1 DDQ V , V Supply Voltage, I/O Supply Voltage 0 0 V SS SSQ V I/O Reference Voltage 0.49 x V 0.51 x V V1, 2 REF DDQ DDQ V I/O Termination Voltage (System) V � 0.04 V � 0.04 V 1, 3 TT REF REF V Input High (Logic1) Voltage V � 0.15 V � 0.3 V 1 IH(DC) REF DDQ V Input Low (Logic0) Voltage ��0.3 V � 0.15 V 1 IL(DC) REF V Input Voltage Level, CK and CK Inputs ��0.3 V � 0.3 V 1 IN(DC) DDQ V Input Differential Voltage, CK and CK Inputs 0.36 V � 0.6 V 1, 4 ID(DC) DDQ VI VI-Matching Pullup Current to Pulldown Current 0.71 1.4 5 Ratio Input Leakage Current. Any input 0V � V ��V IN DD I ��22 �A1 I (All other pins not under test � 0V) Output Leakage Current I ��55 �A1 OZ (DQs are disabled; 0V � V ��V out DDQ Output High Current, Normal Strength Driver I ��16.2 mA 1 OH (V � 1.95 V, V � 1.13 V) OUT TT Output Low Current, Normal Strength Driver I 16.2 mA 1 OL (V � 0.35 V, V � 1.17 V) OUT TT 1. Inputs are not recognized as valid until V stabilizes. REF 2. V is expected to be equal to 0.5 V of the transmitting device, and to track variations in the DC level of the REF DDQ same. Peak-to-peak noise on V may not exceed ± 2% of the DC value. REF 3. V is not applied directly to the device. V is a system supply for signal termination resistors, is expected to be set TT TT equal to V , and must track variations in the DC level of V . REF REF 4. V is the magnitude of the difference between the input level on CK and the input level on CK ID 5. The ration of the pullup current to the pulldown current is specified for the same temperature and voltage, over the entire temperature and voltage range, for device drain to source voltage from 0.25 to 1.0V. For a given output, it rep- resents the maximum difference between pullup and pulldown drivers due to process variation. 2003-01-09, V1.1 Page 52 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Normal Strength Pulldown and Pullup Characteristics 1. The nominal pulldown V-I curve for DDR SDRAM devices is expected, but not guaranteed, to lie within the inner bounding lines of the V-I curve. 2. The full variation in driver pulldown current from minimum to maximum process, temperature, and voltage lie within the outer bounding lines of the V-I curve. Normal Strength Pulldown Characteristics 140 Maximum 120 100 Nominal High 80 60 Nominal Low 40 Minimum 20 0 0 0.5 1 1.5 2 2.5 V (V) OUT 3. The nominal pullup V-I curve for DDR SDRAM devices is expected, but not guaranteed, to lie within the inner bounding lines of the V-I curve. 4. The full variation in driver pullup current from minimum to maximum process, temperature, and voltage lie within the outer bounding lines of the V-I curve. Normal Strength Pullup Characteristics 0 -20 Minimum -40 Nominal Low -60 -80 -100 -120 -140 Nominal High -160 Maximum 0 0.51 1.52 2.5 (V) V OUT 5. The full variation in the ratio of the maximum to minimum pullup and pulldown current does not exceed 1.7, for device drain to source voltages from 0.1 to 1.0. 6. The full variation in the ratio of the nominal pullup to pulldown current should be unity � 10�, for device drain to source voltages from 0.1 to 1.0V. 2003-01-09, V1.1 Page 53 of 77 1 (mA) 1 (mA) OUT OUT HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Normal Strength Pulldown and Pullup Currents Pulldown Current (mA) Pullup Current (mA) Nominal Nominal Nominal Nominal Voltage (V) Min Max Min Max Low High Low High 0.1 6.0 6.8 4.6 9.6 �6.1 �7.6 �4.6 �10.0 0.2 12.2 13.5 9.2 18.2 �12.2 �14.5 �9.2 �20.0 0.3 18.1 20.1 13.8 26.0 �18.1 �21.2 �13.8 �29.8 0.4 24.1 26.6 18.4 33.9 �24.0 �27.7 �18.4 �38.8 0.5 29.8 33.0 23.0 41.8 �29.8 �34.1 �23.0 �46.8 0.6 34.6 39.1 27.7 49.4 �34.3 �40.5 �27.7 �54.4 0.7 39.4 44.2 32.2 56.8 �38.1 �46.9 �33.2 �61.8 0.8 43.7 49.8 36.8 63.2 �41.1 �53.1 �36.0 �69.5 0.9 47.5 55.2 39.6 69.9 �43.8 �59.4 �38.2 ����� 1.0 51.3 60.3 42.6 76.3 �46.0 �65.5 �38.7 �85.2 1.1 54.1 65.2 44.8 82.5 �47.8 �71.6 �39.0 �93.0 1.2 56.2 69.9 46.2 88.3 �49.2 �77.6 �39.2 �100.6 1.3 57.9 74.2 47.1 93.8 �50.0 �83.6 �39.4 �108.1 1.4 59.3 78.4 47.4 99.1 �50.5 �89.7 �39.6 �115.5 1.5 60.1 82.3 47.7 103.8 �50.7 �95.5 �39.9 �123.0 1.6 60.5 85.9 48.0 108.4 �51.0 �101.3 �40.1 �130.4 1.7 61.0 89.1 48.4 112.1 �51.1 �107.1 �40.2 �136.7 1.8 61.5 92.2 48.9 115.9 �51.3 �112.4 �40.3 �144.2 1.9 62.0 95.3 49.1 119.6 �51.5 �118.7 �40.4 �150.5 2.0 62.5 97.2 49.4 123.3 �51.6 �124.0 �40.5 �156.9 2.1 62.9 99.1 49.6 126.5 �51.8 �129.3 �40.6 �163.2 2.2 63.3 100.9 49.8 129.5 �52.0 �134.6 �40.7 �169.6 2.3 63.8 101.9 49.9 132.4 �52.2 �139.9 �40.8 �176.0 2.4 64.1 102.8 50.0 135.0 �52.3 �145.2 �40.9 �181.3 2.5 64.6 103.8 50.2 137.3 �52.5 �150.5 �41.0 �187.6 2.6 64.8 104.6 50.4 139.2 -52.7 -155.3 -41.1 -192.9 2.7 65.0 105.4 50.5 140.8 -52.8 -160.1 -41.2 -198.2 Evaluation Conditions for I/O Driver Characteristics Nominal Minimum Maximum 25 �C70 �C0 �C Operating Temperature V / V 2.5V 2.3V 2.7V DD DDQ typical slow-slow fast-fast Process Corner 2003-01-09, V1.1 Page 54 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Weak Strength Pulldown and Pullup Characteristics Weak Strength Pulldown Characteristics 80 Maximum 70 60 Typical high 50 Typical low 40 30 Minimum 20 10 0 0,00,5 1,01,5 2,02,5 Vout [V] 1. The weak pulldown V-I curve for DDR SDRAM devices is expected, but not guaranteed, to lie within the inner bounding lines of the V-I curve 2. The weak pullup V-I curve for DDR SDRAM devices is expected, but not guaranteed, to lie within the inner bounding lines of the V-I curve. 3. The full variation in driver pullup current from minimum to maximum process, temperature, and voltage lie within the outer bounding lines of the V-I curve. Weak Strength Pullup Characteristics 0,0 0,0 0,5 1,0 1,5 2,0 2,5 -10,0 Minimum -20,0 -30,0 Typical low -40,0 -50,0 Typical high -60,0 -70,0 Maximum -80,0 Vout [V] 4. The full variation in the ratio of the maximum to minimum pullup and pulldown current does not exceed 1.7, for device drain to source voltages from 0.1 to 1.0. 5. The full variation in the ratio of the nominal pullup to pulldown current should be unity � 10�, for device drain to source voltages from 0.1 to 1.0V. 2003-01-09, V1.1 Page 55 of 77 Iout [V] Iout [mA] HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Weak Strength Driver Pulldown and Pullup Currents Pulldown Current (mA) Pullup Current (mA) Nominal Nominal Nominal Nominal Voltage (V) Min Max Min Max Low High Low High 0.1 3.4 3.8 2.6 5.0 -3.5 -4.3 -2.6 -5.0 0.2 6.9 7.6 5.2 9.9 -6.9 -8.2 -5.2 -9.9 0.3 10.3 11.4 7.8 14.6 -10.3 -12.0 -7.8 -14.6 0.4 13.6 15.1 10.4 19.2 -13.6 -15.7 -10.4 -19.2 0.5 16.9 18.7 13.0 23.6 -16.9 -19.3 -13.0 -23.6 0.6 19.6 22.1 15.7 28.0 -19.4 -22.9 -15.7 -28.0 0.7 22.3 25.0 18.2 32.2 -21.5 -26.5 -18.2 -32.2 0.8 24.7 28.2 20.8 35.8 -23.3 -30.1 -20.4 -35.8 0.9 26.9 31.3 22.4 39.5 -24.8 -33.6 -21.6 -39.5 1.0 29.0 34.1 24.1 43.2 -26.0 -37.1 -21.9 -43.2 1.1 30.6 36.9 25.4 46.7 -27.1 -40.3 -22.1 -46.7 1.2 31.8 39.5 26.2 50.0 -27.8 -43.1 -22.2 -50.0 1.3 32.8 42.0 26.6 53.1 -28.3 -45.8 -22.3 -53.1 1.4 33.5 44.4 26.8 56.1 -28.6 -48.4 -22.4 -56.1 1.5 34.0 46.6 27.0 58.7 -28.7 -50.7 -22.6 -58.7 1.6 34.3 48.6 27.2 61.4 -28.9 -52.9 -22.7 -61.4 1.7 34.5 50.5 27.4 63.5 -28.9 -55.0 -22.7 -63.5 1.8 34.8 52.2 27.7 65.6 -29.0 -56.8 -22.8 -65.6 1.9 35.1 53.9 27.8 67.7 -29.2 -58.7 -22.9 -67.7 2.0 35.4 55.0 28.0 69.8 -29.2 -60.0 -22.9 -69.8 2.1 35.6 56.1 28.1 71.6 -29.3 -61.2 -23.0 -71.6 2.2 35.8 57.1 28.2 73.3 -29.5 -62.4 -23.0 -73.3 2.3 36.1 57.7 28.3 74.9 -29.5 -63.1 -23.1 -74.9 2.4 36.3 58.2 28.3 76.4 -29.6 -63.8 -23.2 -76.4 2.5 36.5 58.7 28.4 77.7 -29.7 -64.4 -23.2 -77.7 2.6 36.7 59.2 28.5 78.8 -29.8 -65.1 -23.3 -78.8 2.7 36.8 59.6 28.6 79.7 -29.9 -65.8 -23.3 -79.7 Evaluation Conditions for I/O Driver Characteristics Nominal Minimum Maximum 25 �C70 �C0 �C Operating Temperature 2.5V 2.3V 2.7V V / V DD DDQ typical slow-slow fast-fast Process Corner 2003-01-09, V1.1 Page 56 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B IDD Specification and Conditions (0 �C ��T ��70��C��V = 2.5V ��0.2V; V = 2.5V ��0.2V) A DDQ DD DDR200 DDR266A DDR266 DDR333 Notes -8 -7 -7F -6 Symbol Parameter/Condition Unit typ. max. typ. max. typ. max. typ. max. 4 Operating Current: one bank; active / precharge; tRC = tRC MIN; x4/x8 70 90 75100 83 11085110 mA IDD0 DQ, DM, and DQS inputs changing once per clock cycle; address 1, 2 and control inputs changing once every two clock cycles x16 72 95 77105 86 11588115 mA Operating Current: one bank; active/read/precharge; x4/x8 80 100 90 110 98 120 100 120 mA IDD1 burst length 4; 1, 2 Refer to the following page for detailed test conditions. x16 83 105 94 115 102 125 104 125 mA Precharge Power-Down Standby Current: all banks idle; power-down mode; IDD2P 57 68 68 69 mA 1, 2 CKE <= VIL MAX Precharge Floating Standby Current: /CS >= VIH MIN, all banks idle; IDD2F CKE >= VIH MIN; address and other control inputs changing once per clock cycle, VIN 30 35 35 40 35 40 45 55 mA 1, 2 = VREF for DQ, DQS and DM. Precharge Quiet Standby Current: /CS >= VIH MIN, all banks idle; IDD2Q CKE >= VIH MIN; address and other control inputs stable 18 22 20 25 20 25 25 28 mA 1, 2 at >= VIH MIN or <= VIL MAX; VIN = VREF for DQ, DQS and DM. Active Power-Down Standby Current: one bank active; power-down mode; IDD3P 13 16 15 18 15 18 18 21 mA 1, 2 CKE <= VIL MAX; VIN = VREF for DQ, DQS and DM. Active Standby Current: one bank active; CS >= VIH MIN; x4/x8 4045505550556065 mA CKE >= VIH MIN; tRC = tRAS MAX; DQ, DM, and DQS inputs IDD3N 1, 2 changing twice per clock cycle; address and control inputs x16 4250526052606370 mA changing once per clock cycle Operating Current: one bank active; BL2; reads; continuous burst; x4/x8 79 95 95 115 95 115 110 140 mA address and control inputs changing once per clock cycle; 50% of IDD4R 1, 2 data outputs changing on every clock edge; CL2 for DDR200 and x16 89 110 107 130 107 130 124 160 mA DDR266(A), CL3 for DDR333 and DDR400; IOUT = 0mA Operating Current: one bank active; Burst = 2; writes; continuous x4/x8 85 105 105 125 105 125 125 145 mA burst; address and control inputs changing once per clock cycle; IDD4W 1, 2 50% of data outputs changing on every clock edge; CL2 for x16 96 120 119 140 119 140 141 165 mA DDR200 and DDR266(A), CL3 for DDR333 and DDR400 IDD5 Auto-Refresh Current: tRC = tRFC MIN, distributed refresh 126 170 135 180 135 180 144 190 mA 1, 2 standard version 1.5 2.5 1.5 2.5 1.5 2.5 1.5 2.5 mA IDD6 Self-Refresh Current: CKE <= 0.2V; external clock on 1, 2, 3 low power version 1.201.251.201.251.201.251.201.25 mA Operating Current: four bank; four bank interleaving with burst x4/x8 150 210 171 225 171 225 208 270 IDD7 length 4; mA 1, 2 Refer to the following page for detailed test conditions. x16 158 220 180 235 180 235 218 285 1. IDD specifications are tested after the device is properly initialized and measured at 100 MHz for DDR200, 133 MHz for DDR266(A) and 166 MHz for DDR333 2. Input slew rate = 1V/ns. 3. Enables on-chip refresh and address counters 4. Test condition for typical values : VDD = 2.5V ,Ta = 25°C, test condition for maximum values: test limit at VDD = 2.7V ,Ta = 10°C 2003-01-09, V1.1 Page 57 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Detailed test conditions for DDR SDRAM IDD1 and IDD7 IDD1 : Operating current : One bank operation 1. Only one bank is accessed with t , Burst Mode, Address and Control inputs on NOP edge are changing once RC(min) per clock cycle. l = 0 mA out 2. Timing patterns - DDR200 (100Mhz, CL=2) : tCK = 10 ns, CL=2, BL=4, tRCD = 2 * tCK, tRAS = 5 * tCK Setup: A0 N R0 N N P0 N Read : A0 N R0 N N P0 N - repeat the same timing with random address changing 50% of data changing at every burst - DDR266A (133Mhz, CL=2) : tCK = 7.5 ns, CL=2, BL=4, tRCD = 3 * tCK, tRC = 9 * tCK, tRAS = 5 * tCK Setup: A0 N N R0 N P0 N N N Read : A0 N N R0 N P0 N NN - repeat the same timing with random address changing 50% of data changing at every burst - DDR333 (166Mhz, CL=2.5) : tCK = 6 ns, CL=2.5, BL=4, tRCD = 3 * tCK, tRC = 9 * tCK, tRAS = 5 * tCK Setup: A0 N N R0 N P0 N N N Read : A0 N N R0 N P0 N N N - repeat the same timing with random address changing 50% of data changing at every burst 3.Legend : A=Activate, R=Read, W=Write, P=Precharge, N=NOP IDD7 : Operating current: Four bank operation 1. Four banks are being interleaved with t , Burst Mode, Address and Control inputs on NOP edge are not RC(min) changing. l = 0 mA out 2. Timing patterns - DDR200 (100Mhz, CL=2) : tCK = 10 ns, CL=2, BL=4, tRRD = 2 * tCK, tRCD= 3 * tCK, Read with autoprecharge Setup: A0 N A1 R0 A2 R1 A3 R2 Read : A0 R3 A1 R0 A2 R1 A3 R2- repeat the same timing with random address changing 50% of data changing at every burst - DDR266A (133Mhz, CL=2) : tCK = 7.5 ns, CL=2, BL=4, tRRD = 2 * tCK, tRCD = 3 * tCK Setup: A0 N A1 R0 A2 R1 A3 R2 N R3 Read : A0 N A1 R0 A2 R1 A3 R2 N R3 - repeat the same timing with random address changing 50% of data changing at every burst - DDR333 (166Mhz, CL=2.5) : tCK = 6 ns, CL=2.5, BL=4, tRRD = 2 * tCK, tRCD = 3 * tCK Setup: A0 N A1 R0 A2 R1 A3 R2 N R3 Read : A0 N A1 R0 A2 R1 A3 R2 N R3 - repeat the same timing with random address changing 50% of data changing at every burst 3.Legend : A=Activate, R=Read, W=Write, P=Precharge, N=NOP 2003-01-09, V1.1 Page 58 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B AC Characteristics (Notes 1-6 apply to the following Tables: Electrical Characteristics and DC Operating Conditions, AC Operating Conditions, I Specifications and Conditions, and Electrical Characteristics and AC Timing.) DD 1. All voltages referenced to V . SS 2. Tests for AC timing, I , and electrical, AC and DC characteristics, may be conducted at nominal reference/supply DD voltage levels, but the related specifications and device operation are guaranteed for the full voltage range specified. 3. The figure below represents the timing reference load used in defining the relevant timing parameters of the part. It is not intended to be either a precise representation of the typical system environment nor a depiction of the actual load presented by a production tester. System designers will use IBIS or other simulation tools to correlate the timing ref- erence load to a system environment. Manufacturers will correlate to their production test conditions (generally a coaxial transmission line terminated at the tester electronics). 4. AC timing and I tests may use a V to V swing of up to 1.5V in the test environment, but input timing is still refer- DD IL IH enced to V (or to the crossing point for CK, CK), and parameter specifications are guaranteed for the specified AC REF input levels under normal use conditions. The minimum slew rate for the input signals is 1V/ns in the range between V and V . IL(AC) IH(AC) 5. The AC and DC input level specifications are as defined in the SSTL_2 Standard (i.e. the receiver effectively switches as a result of the signal crossing the AC input level, and remains in that state as long as the signal does not ring back above (below) the DC input LOW (HIGH) level) 6. For System Characteristics like Setup & Holdtime Derating for Slew Rate, I/O Delta Rise/Fall Derating,DDR SDRAM Slew Rate Standards, Overshoot & Undershoot specification and Clamp V-I characteristics see the latest JEDEC specification for DDR components AC Output Load Circuit Diagram / Timing Reference Load V TT 50� Output Timing Reference Point (V ) OUT 30pF AC Operating Conditions ) (0 °C ��TA ��70��C��VDDQ = 2.5V ��0.2V; VDD = 2.5V ��0.2V) Symbol Parameter/Condition Min Max Unit Notes V Input High (Logic 1) Voltage, DQ, DQS, and DM Signals V + 0.31 V 1, 2 IH(AC) REF V Input Low (Logic 0) Voltage, DQ, DQS, and DM Signals V � 0.31 V 1, 2 IL(AC) REF V Input Differential Voltage, CK and CK Inputs 0.7 V + 0.6 V 1, 2, 3 ID(AC) DDQ V Input Closing Point Voltage, CK and CK Inputs 0.5*V � 0.2 0.5*V � 0.2 V 1, 2, 4 IX(AC) DDQ DDQ 1. Input slew rate = 1V/ns� 2. Inputs are not recognized as valid until V stabilizes. REF 3. V is the magnitude of the difference between the input level on CK and the input level on CK. ID 4. The value of V is expected to equal 0.5*V of the transmitting device and must track variations in the DC level of the same. IX DDQ 2003-01-09, V1.1 Page 59 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Electrical Characteristics & AC Timing - Absolute Specifications (0 �C ��T ��70��C��V = 2.5V ��0.2V; V = 2.5V ��0.2V) (Part 1 of 2) A DDQ DD DDR200 DDR266A DDR266 DDR333 -8 -7 -7F -6 Symbol Parameter Unit Notes Min Max Min Max Min Max Min Max t DQ output access time from CK/CK � 0.8 � 0.8 � 0.75 � 0.75 � 0.75 � 0.75 � 0.7 � 0.7 ns 1-4 AC t DQS output access time from CK/CK � 0.8 � 0.8 � 0.75 � 0.75 � 0.75 � 0.75 � 0.6 � 0.6 ns 1-4 DQSCK t CK high-level width 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 t 1-4 CH CK t CK low-level width 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 t 1-4 CL CK t Clock Half Period min (t , t )min (t , t )min (t , t )min (t , t)ns 1-4 HP CL CH CL CH CL CH CL CH t CL = 3.0 8 12 7 12 7 12 6 12 ns 1-4 CK t Clock cycle time CL = 2.5 8 12 7 12 7 12 6 12 ns 1-4 CK t CL = 2.0 10 12 7.5 12 7.5 12 7.5 12 ns 1-4 CK t DQ and DM input hold time 0.6 0.5 0.5 0.45 ns 1-4 DH t DQ and DM input setup time 0.6 0.5 0.5 0.45 ns 1-4 DS Control & Addr. input pulse width (each t 2.5 2.2 2.2 2.2 ns 1-4,10 IPW input) t DQ and DM input pulse width (each input) 2.0 1.75 1.75 1.75 ns 1-4, 10 DIPW Data-out high-impedence time from t � 0.8 � 0.8 � 0.75 � 0.75 � 0.75 � 0.75 � 0.7 � 0.7 ns 1-4, 5 HZ CK/CK t Data-out low-impedence time from CK/CK � 0.8 � 0.8 � 0.75 � 0.75 � 0.75 � 0.75 � 0.7 � 0.7 ns 1-4, 5 LZ Write command to 1st DQS latching t 0.75 1.25 0.75 1.25 0.75 1.25 0.75 1.25 t 1-4 DQSS CK transition DQS-DQ skew TSOP66 � 0.6 � 0.5 � 0.5 � 0.45 ns 1-4 t (DQS & associated DQ DQSQ BGA � 0.6 � 0.5 � 0.5 � 0.40 ns 1-4 signals) TSOP66 1.0 0.75 0.75 0.55 ns 1-4 Data hold skew factor t QHS BGA 1.0 0.75 0.75 0.5 ns 1-4 t DQ output hold time from DQS t -t t -t t -t t -t 1-4 QH HP QHS HP QHS HP QHS HP QHS ns DQS input low (high) pulse width (write t 0.35 0.35 0.35 0.35 t 1-4 DQSL,H CK cycle) DQS falling edge to CK setup time (write t 0.2 0.2 0.2 0.2 t 1-4 DSS CK cycle) DQS falling edge hold time from CK (write t 0.2 0.2 0.2 0.2 t 1-4 DSH CK cycle) t Mode register set command cycle time 2 2 2 2 t 1-4 MRD CK t Write preamble setup time 0 0 0 0 ns 1-4, 7 WPRES t Write postamble 0.40 0.60 0.40 0.60 0.40 0.60 0.40 0.60 t 1-4, 6 WPST CK t Write preamble 0.25 0.25 0.25 0.25 t 1-4 WPRE CK fast slew rate 1.1 0.9 0.9 0.75 ns Address and control input t IS setup time slow slew rate 1.1 1.0 1.0 0.8 ns 2-4, 10,11 fast slew rate 1.1 0.9 0.9 0.75 ns Address and control input t IH hold time slow slew rate 1.1 1.0 1.0 0.8 ns 2003-01-09, V1.1 Page 60 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Electrical Characteristics & AC Timing - Absolute Specifications (0 �C ��T ��70��C��V = 2.5V ��0.2V; V = 2.5V ��0.2V) (Part 2 of 2) A DDQ DD DDR200 DDR266A DDR266 DDR333 -8 -7 -7F -6 Symbol Parameter Unit Notes Min Max Min Max Min Max Min Max t Read preamble 0.9 1.1 0.9 1.1 0.9 1.1 0.9 1.1 t 1-4 RPRE CK t Read postamble 0.40 0.60 0.40 0.60 0.40 0.60 0.40 0.60 t 1-4 RPST CK t Active to Precharge command 50 120,000 45 120,000 45 120,000 42 70,000 ns 1-4 RAS Active to Active/Auto-refresh command t 70 65 60 60 ns 1-4 RC period Auto-refresh to Active/Auto-refresh com- t 80 75 75 72 ns 1-4 RFC mand period t Active to Read or Write delay 20 20 15 18 ns 1-4 RCD t Precharge command period 20 20 15 18 ns 1-4 RP t Active to Autoprecharge delay 20 20 20 18 ns 1-4 RAP t Active bank A to Active bank B command 15 15 15 12 ns 1-4 RRD t Write recovery time 15 15 15 15 ns 1-4 WR Auto precharge write recovery (twr/tck) + (trp/tck) t t 1-4,9 DAL CK + precharge time t Internal write to read command delay 1 1 1 1 t 1-4 WTR CK t Exit self-refresh to non-read command 80 75 75 75 ns 1-4 XSNR t Exit self-refresh to read command 200 200 200 200 t 1-4 XSRD CK Average Periodic Refresh Interval (8192 t refresh commands per 64ms refresh 7.8 7.8 7.8 7.8 �s1-4, 8 REFI period) 1. Input slew rate >= 1V/ns for DDR266 & DDR333 and = 1V/ns for DDR 200 2. The CK/CK input reference level (for timing reference to CK/CK) is the point at which CK and CK cross: the input reference level for signals other than CK/CK, is V CK/CK slew rate are >= 1.0 V/ns REF. 3. Inputs are not recognized as valid until V stabilizes. REF 4. The Output timing reference level, as measured at the timing reference point indicated in AC Characteristics (Note 3) is V . TT 5. t and t transitions occur in the same access time windows as valid data transitions. These parameters are not referred to a specific voltage HZ LZ level, but specify when the device is no longer driving (HZ), or begins driving (LZ). 6. The maximum limit for this parameter is not a device limit. The device operates with a greater value for this parameter, but system performance (bus turnaround) degrades accordingly. 7. The specific requirement is that DQS be valid (HIGH, LOW, or some point on a valid transition) on or before this CK edge. A valid transition is defined as monotonic and meeting the input slew rate specifications of the device. When no writes were previously in progress on the bus, DQS will be transitioning from Hi-Z to logic LOW. If a previous write was in progress, DQS could be HIGH, LOW, or transitioning from HIGH to LOW at this time, depending on t . DQSS 8. A maximum of eight Autorefresh commands can be posted to any given DDR SDRAM device. 9. For each of the terms, if not already an integer, round to the next highest integer. tCK is equal to the actual system clock cycle time. 10. These parameters guarantee device timing, but they are not necessarilty tested on each device 11. Fast slew rate >= 1.0 V/ns , slow slew rate >= 0.5 V/ns and < 1V/ns for command/address and CK & CK slew rate >1.0 V/ns, measured between VOH(ac) and VOL(ac) 2003-01-09, V1.1 Page 61 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Electrical Characteristics & AC Timing for DDR266 - Applicable Specifications Expressed in Clock Cycles (tCK=133Mhz) (0 �C ��T ��70��C��V = 2.5V ��0.2V; V = 2.5V ��0.2V, A DDQ DD tCK = 133MHz Symbol Parameter sort Units Notes Min Max t Mode register set command cycle time 2 t 1-54 MRD CK t Write preamble 0.25 t 1-5 WPRE CK t Active to Precharge command 6 16000 t 1-5 RAS CK DDR266A 9 t 1-5 CK t Active to Active/Auto-refresh command period RC DDR266 8 t 1-5 CK Auto-refresh to Active/Auto-refresh t 10 t 1-5 RFC CK command period DDR266A 3 t 1-5 CK t Active to Read or Write delay RCD DDR266 2 t 1-5 CK DDR266A 3 t 1-5 CK t Precharge command period RP DDR266 2 t 1-5 CK t Active bank A to Active bank B command 2 t 1-5 RRD CK t Write recovery time 2 t 1-5 WR CK t Auto precharge write recovery + precharge time 5 t 1-5 DAL CK t Internal write to read command delay 1 t 1-5 WTR CK t Exit self-refresh to non-read command 10 t 1-5 XSNR CK t Exit self-refresh to read command 200 t 1-5 XSRD CK 1. Input slew rate = 1V/ns 2. The CK/CK input reference level (for timing reference to CK/CK) is the point at which CK and CK cross: the input ref- erence level for signals other than CK/CK, is V REF. 3. Inputs are not recognized as valid until V stabilizes. REF 4. The Output timing reference level, as measured at the timing reference point indicated in AC Characteristics (Note 3) is V . TT 5. t and t transitions occur in the same access time windows as valid data transitions. These parameters are not HZ LZ referred to a specific voltage level, but specify when the device is no longer driving (HZ), or begins driving (LZ). 2003-01-09, V1.1 Page 62 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Timing Diagrams Data Input (Write) (Timing Burst Length = 4) t DQSL t DQSH DQS t DH t DS DI n DQ t DH t DS DM DI n = Data In for column n. Don’t Care 3 subsequent elements of data in are applied in programmed order following DI n. Data Output (Read) (Timing Burst Length = 4) DQS t DQSQ max t QH DQ t (Data output hold time from DQS) QH t and t are only shown once and are shown referenced to different edges of DQS, only for clarify of illustration. DQSQ QH . t and t both apply to each of the four relevant edges of DQS. DQSQ QH t is used to determine the worst case setup time for controller data capture. DQSQ max. t is used to determine the worst case hold time for controller data capture. QH 2003-01-09, V1.1 Page 63 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Initialize and Mode Register Sets 2003-01-09, V1.1 Page 64 of 77 VDD * VTT is not applied directly to the device, however t must be VTD greater than or equal to zero to avoid device latchup. VDDQ ** t is required before any command can be applied and MRD 200 cycles of CK are required before a Read command can be applied. t VTD The two Autorefresh commands may be moved to follow the first MRS, VTT (System*) but precede the second Precharge All command. VREF t CK 200 cycles of CK** t CH t t t t t t 200�s t MRD MRD RP RFC RFC MRD CL CK CK t IH t IS LVCMOS LOW LEVEL CKE t IH t IS NOP PRE EMRS MRS PRE AR AR MRS ACT Command DM t IH t IS CODE CODE CODE RA A0-A9, A11, A12 t t t IH IH IH t t t IS IS IS CODE CODE CODE RA A10 ALL BANKS ALL BANKS t IH t IS BA0=L BA BA0, BA1 BA0=H BA0=L High-Z BA1=L BA1=L BA1=L DQS High-Z DQ Power-up: Extended Mode Load Mode Load Mode Don’t Care VDD and CK Register Set Register, Reset DLL Register stable (with A8 = L) HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Power Down Mode 2003-01-09, V1.1 Page 65 of 77 t t t CK CH CL C K C K t IH t t t IS IS IS CKE t IH t IS VALID* NOP VALID Command NOP t IH t IS VALID VALID ADDR DQS DQ DM Enter Power Exit Power Down Mode Down Mode No column accesses are allowed to be in progress at the time power down is entered. * = If this command is a Precharge (or if the device is already in the idle state) then the power down mode Don’t Care shown is Precharge power down. If this command is an Active (or if at least one row is already active), then the power down mode shown is Active power down. HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Auto Refresh Mode 2003-01-09, V1.1 Page 66 of 77 t RP t CH t t CK CL t t RFC RFC CK CK t IH t IS VALID VALID CKE t IH t IS NOP PRE NOP NOP AR NOP AR NOP NOP ACT Command RA A0-A8 RA A9, A11,A12 ALL BANKS RA A10 ONE BANK t IH t IS BANK(S) BA BA0, BA1 DQS DQ DM PRE = Precharge; ACT = Active; RA = Row address; BA = Bank address; AR = Autorefresh. NOP commands are shown for ease of illustration; other valid commands may be possible at these times. DM, DQ, and DQS signals are all don't care/high-Z for operations shown. Don’t Care HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Self Refresh Mode 2003-01-09, V1.1 Page 67 of 77 Clock must be stable before exiting Self Refresh Mode t * RP t CK 200 cycles t t CH CL CK CK t IH t IS t t IS IS CKE t IH t t XSRD, XSRN t IS NOP AR NOP VALID Command t IH t IS VALID ADDR DQS DQ DM Enter Self Exit Self Refresh Mode Refresh Mode * = Device must be in the all banks idle state before entering Self Refresh Mode. ** = t is required before any non-read command can be applied, and t (200 cycles of CK). Don’t Care XSNR XSRD are required before a Read command can be applied. HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Read without Auto Precharge (Burst Length = 4) 2003-01-09, V1.1 Page 68 of 77 t t CL CK t t CH RP C K C K t IH t t IS IH VALID VALID VALID CKE t IH t IS NOP Read NOP PRE NOP NOP ACT NOP NOP NOP Command t IH t IS COL n RA A0-A9, A11, A12 t IH t ALL BANKS IS RA A10 DIS AP ONE BANK t IH t IS BA x BA x* BA x BA0, BA1 DM t (min) LZ t RPRE DQS t (min) HZ Case 1: t (min) AC t RPST t /t = min AC DQSCK CL=2 t (min) DQSCK DQ DO n t (max) LZ t RPRE DQS t (max) HZ Case 2: t (max) AC t RPST t /t = max AC DQSCK t (max) LZ t (max) DQSCK DQ DO n DO n = data out from column n. 3 subsequent elements of data out are provided in the programmed order following DO n. DIS AP = Disable Auto Precharge. * = Don't care if A10 is High at this point. Don’t Care PRE = Precharge; ACT = Active; RA = Row address; BA = Bank address. NOP commands are shown for ease of illustration; other commands may be valid at these times. HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Read with Auto Precharge (Burst Length = 4) 2003-01-09, V1.1 Page 69 of 77 t t CK CL t t RP CH C K C K t IH t IH t IS VALID VALID VALID CKE t IH t IS NOP Read NOP NOP NOP NOP ACT NOP NOP NOP Command t IH t IS A0-A9, A11, A12 COL n RA t IH t IS RA A10 EN AP t IH t IS BA x BA0, BA1 BA x DM t (min) LZ t RPRE DQS t (min) LZ t (min) HZ Case 1: t (min) AC t RPST t /t = min AC DQSCK CL=2 t (min) DQSCK DQ DO n t (max) LZ t RPRE DQS t (max) HZ Case 2: t (max) AC t RPST t /t = max AC DQSCK t (max) LZ t (max) DQSCK DQ DO n DO n = data out from column n. 3 subsequent elements of data out are provided in the programmed order following DO n. Don’t Care EN AP = enable Auto Precharge. ACT = active; RA = row address. NOP commands are shown for ease of illustration; other commands may be valid at these times. HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Bank Read Access (Burst Length = 4) 2003-01-09, V1.1 Page 70 of 77 t t CK CL t CH C K C K t t RC IH t IS VALID CKE t IH t IS NOP ACT NOP Read NOP PRE NOP NOP ACT NOP Command t IH t IS A0-A9, A11, A12 RA COL n RA t IH t IS ALL BANKS RA RA RA A10 DIS AP ONE BANK t IH t IS BA x BA x BA x* BA x BA0, BA1 DM t (min) LZ t RP t RPRE DQS t RCD t (min) HZ t (min) LZ Case 1: t t (min) AC RAS t RPST t /t = min AC DQSCK CL CL= =2 2 t (min) DQSCK DQ DO n t (max) LZ t RPRE DQS t (max) HZ Case 2: t (max) AC t t /t = max RPST AC DQSCK t (max) LZ t (max) DQSCK DQ DO n DO n = data out from column n. 3 subsequent elements of data out are provided in the programmed order following DO n. DIS AP = disable Auto Precharge. Don’t Care * = Don't care if A10 is High at this point. PRE = Precharge; ACT = Active; RA = Row address; BA = Bank address. NOP commands are shown for ease of illustration; other commands may be valid at these times. HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write without Auto Precharge (Burst Length = 4) 2003-01-09, V1.1 Page 71 of 77 t CH t t t CK WR t CL RP C K C K t IH t t IS IH VALID CKE t IH t IS NOP Write NOP NOP NOP PRE NOP NOP ACT Command NOP t IH t IS A0-A9, A11, A12 COL n RA t IH t IS ALL BANKS DIS AP RA A10 ONE BANK t IH t IS BA x BA x* BA BA0, BA1 t t DSH WPRE t WPRES t DQSH t t DQSS DQSL t WPST DQS DIn DQ DM t = min. DQSS DIn = Data in for column n. Don’t Care 3 subsequent elements of data in are applied in the programmed order following DIn. DIS AP = Disable Auto Precharge. * = Don't care if A10 is High at this point. PRE = Precharge; ACT = Active; RA = Row address; BA = Bank address. NOP commands are shown for ease of illustration; other valid commands may be possible at these times. HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write with Auto Precharge (Burst Length = 4) 2003-01-09, V1.1 Page 72 of 77 t CH t t t WR CK t RP CL C K C K t t IH DAL t IS VALID VALID VALID CKE t IH t IS NOP Write NOP NOP NOP NOP NOP NOP NOP ACT Command t IH t IS A0-A9, A11, A12 COL n RA t IH t IS EN AP RA A10 t IH t IS BA x BA BA0, BA1 t DSH t WPRES t DQSH t t DQSS DQSL t WPST DQS DIn DQ DM t WPRE t = min. DQSS DIn = Data in for column n. 3 subsequent elements of data in are applied in the programmed order following DIn. EN AP = Enable Auto Precharge. ACT = Active; RA = Row address; BA = Bank address. Don’t Care NOP commands are shown for ease of illustration; other valid commands may be possible at these times. HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Bank Write Access (Burst Length = 4) 2003-01-09, V1.1 Page 73 of 77 t CH t t CK CL CK CK t IH t IS VALID CKE t IH t RAS t IS NOP ACT NOP Write NOP NOP NOP NOP PRE NOP Command t IH t IS A0-A9, A11, A12 RA Col n t IH t IS ALL BANKS RA DIS AP A10 ONE BANK t IH t IS BA x BA x BA x BA0, BA1 t RCD t t DSH t WPRES WR t DQSH t t DQSL WPST t DQSS DQS DIn DQ DM t WPRE t = min. DQSS DI n = data in for column n. 3 subsequent elements of data in are applied in the programmed order following DI n. Don’t Care DIS AP = Disable Auto Precharge. * = don't care if A10 is High at this point. PRE = Precharge; ACT = Active; RA = Row address. NOP commands are shown for ease of illustration; other valid commands may be possible at these times. HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Write DM Operation (Burst Length = 4) 2003-01-09, V1.1 Page 74 of 77 t CH t CK t CL CK CK t IH t IS CKE VALID t IH t IS NOP Write NOP NOP NOP NOP PRE NOP NOP ACT Command t IH t IS A0-A9, A11, A12 COL n RA t IH t IS ALL BANKS DIS AP RA A10 ONE BANK t IH t IS BA x BA x* BA BA0, BA1 t DSS t t t WR RP WPRES t t DSH DQSH t t DQSL WPST t DQSS DQS DIn DQ DM DI n = data in for column n. 3 subsequent elements of data in are applied in the programmed order following DI n (the second element of the 4 is masked). DIS AP = Disable Auto Precharge. * = Don't care if A10 is High at this point. PRE = Precharge; ACT = Active; RA = Row address; BA = Bank address. Don’t Care NOP commands are shown for ease of illustration; other valid commands may be possible at these times. t = min. DQSS HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Package Dimensions 60 balls FBGA-Package 12mm x 8mm Plastic Package, P-TSOPII-66 (400mil; 66 lead ) Thin Small Outline Package G auge P lane 10,16±0,13 0,5±0,1 0,65 B asic 0,805 R EF 0.1 ±0,08 0,3 11,76±0,2 S eating P lane 22,22±0,13 TSOP66 Lead #1 2003-01-09, V1.1 Page 75 of 77 0,05 min 1,20 max 0,25 Basic HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Data Sheet Jan. 2003, V1.1 Write to Write 34 TABLE OF CONTENT Random Write Cycles 35 Write to Read 36 Features 1 Write to Read Interrupting 37 Write to Read: Minimum DQSS 38 Description 1 Write to Read: Nominal DQSS 40 Pin Configuration TSOP 2 Write to Precharge Non-Interrupting 40 Pin Configuration BGA 3 Write to Precharge Interrupting 41 Input/Output Functional Description 4 Write to Precharge Minimum DQSS 42 Ordering Information 5 Write to Precharge: Nominal DQSS 43 Block Diagram (32Mb x 4) 6 Precharge 44 Block Diagram (16Mb x 8) 7 Power-Down 45 Block Diagram (8Mb x 16) 8 Truth Table 2: Clock Enable (CKE) 46 Functional Description 9 Truth Table 3: Current State, SameBank) 47 Initialization 10 Truth Table 4: Current State,Different Bank 48 Register Definition 10 Truth Table 5: Concurrent Auto Precharge 49 Mode Register Operation 11 Burst Definition 12 Simplified State Diagram 50 Required CAS Latencies 13 Extended Mode Register 14 Operating Conditions 51 Extended Mode Register Definition 15 Absolute Maximum Ratings 51 Input and Output Capacitances 51 Commands 16 DC Electrical Operating Conditions 52 Delesect, No Operation 16 Normal Strength Characterisitcs 53 Mode Register Set 16 Weak Strength Characterisitcs 55 Active 16 IDD Specifications and Conditions 57 Read 16 AC Characteristics 59 Write 16 AC Output Load Circuit Diagram 59 Precharge 16 Electrical Characteristics & AC Timing 60 Auto Precharge 17 Burst Terminate 17 Timing Diagrams 63 Auto Refresh 17 Data Input (Write) 63 Self Refresh 17 Data Output (Read) 63 Truth Table 1a: Commands 18 Initialize and Mode Register Sets 64 Truth Table 1b: DM Operation 18 Power Down Mode 65 Auto Refresh Mode 66 Self Refresh Mode 67 Operations 19 Read without Auto Precharge 68 Activating a Specific Row in a Specific Bank 19 Read with Auto Precharge 69 tRCD and tRRD Definition 20 Bank Read Access 70 Read Command 21 Write without Auto Precharge. 71 Read Burst 22 Write with Auto Precharge 72 Consecutive Read Bursts 23 Bank Write Access 73 Non-Consecutive Read Bursts 24 Write DM Operation 74 Random Read Accesses 25 Terminating a Read Burst 26 Package Dimensions 75 Read to Write 27 Table of Content 76 Read to Precharge 29 Security Information 77 Write Command 30 Write Burst (Burst Length = 4) 32 Write to Write (Burst Length = 4) 33 2003-01-09, V1.1 Page 76 of 77 HYB25D256[400/800/160]B[T/C](L) 256-Mbit Double Data Rate SDRAM, Die Rev. B Data Sheet Jan. 2003, V1.1 Attention please ! As far as patents or other rights of third parties are concerned, liability is only assumed for components, not for applications, processes and circuits implemented within components or assemblies. This information describes the type of components and shall not be considered as assured characteristics. Terms of delivery and rights to change design reserved. For questions on technology, delivery and prices please contact INFINEON Technologies Offices in Munich or the INFINEON Technologies Sales Offices and Representatives worldwide. Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest INFINEON Technologies office or representative. Packing Please use the recycling operators known to you. We can help you - get in touch with your nearest sales office. By agreement we will take packing material back, if it is sorted. You must bear the costs of transport. For packing material that is returned to us unsorted or which we are not obliged to accept, we shall have to invoice you for any costs incurred. Components used in life-support devices or systems must be expressly authorized for such purpose! 1 Critical components of INFINEON Technologies, may only be used in life- 2 support devices or systems with the express written approval of INFINEON Technologies. 1. A critical component is a component used in a life-support device or system whose failure can reasonably be expected to cause the failure of that life- support device or system, or to affect the safety or effectiveness of that device or system. 2. Life support devices or systems are intended (a) to be implanted in the human body, or (b) to support and/or maintain and sustain human life. If they fail, it is reasonable to assume that the health of the user may be endangered. 2003-01-09, V1.1 Page 77 of 77