VMIVME-5550 Multidrop Reflective Memory with Interrupts • High-speed, easy-to-use parallel network • Data written to memory in one node is also written to memory in all nodes on the network • Multidrop capability (up to 16 nodes) • Data transferred at 20 Mbyte/s (50-foot cable) • Any node on the network can generate an interrupt in any other node on the network or in all network chassis simultaneously • No processor overhead • No processor involvement in the operation of the network • Up to 4 Mbyte of Reflective Memory • Differential line drivers and receivers • A24:A32:D32:D16:D8 memory access • A24:A32:D8 status and control access • Single 6U board INTRODUCTION — VMIVME-5550 is a high-performance multidrop VME-to-VME network. Data is transferred by writing to on-board global RAM. The data is automatically sent to the location in memory on all Reflective Memory boards on the network (refer to Figure 1). POWER REQUIREMENTS SPECIFICATIONS 7.0 A maximum at +5 VDC Memory Size: 256 Kbyte, 512 Kbyte, 1 Mbyte, 2 Mbyte, or 4 Mbyte PHYSICAL/ENVIRONMENTAL Temperature Range: 0 to 55 ˚C, operating Access Time: -40 to 85 °C, storage 360 ns (worst-case arbitration) 200 ns (best-case arbitration) Relative Humidity: 20 to 80 percent, noncondensing TRANSFER SPECIFICATION MTBF: 104,500 hours (217F) Transfer Rate: 1 20 Mbyte/s (longword accesses) 1 10 Mbyte/s (word accesses) 1 5 Mbyte/s (byte accesses) Ordering Options COMPATIBILITY June 18, 2001 800-005550-000 H ABC – D E F VMIVME-5550 –0 – This product complies with the VMEbus specification A = Memory Options (ANSI/IEEE STD 1014-1987, IEC 821, and IEC 297), 0 = 256 Kbyte 1 = 512 Kbyte with the following mnemonics: 2 = 1 Mbyte A32:A24:A16: D32/D16/D08 (EO): 3 = 2 Mbyte 4 = 4 Mbyte Slave: 39/3D:09/0D B = FIFO Option Form factor: 6U 0 = 512 Transfer FIFO 1 = 4 Kbyte Transfer FIFO C = 0 (Option reserved for future use) INTERCONNECTION Connector Data Compatible Connector Panduit No. 120-964-435 Cable Requirements: Two 64-conductor twist-n-flat Strain Relief Panduit No. 100-000-072 ribbon cables. A wide variety of standard lengths are PC Board Connector Panduit No. 120-964-033A available. Note Panduit it also known as ITW/Pancon. Cable Length: 1,000 ft maximum For Ordering Information, Call: 1-800-322-3616 or 1-256-880-0444 • FAX (256) 882-0859 E-mail: info@vmic.com Web Address: www.vmic.com Configuration: Linear with up to 16 nodes Copyright © April 1990 by VMIC Specifications subject to change without notice. 1. Network transfer rate with a total cable length of 5 feet. VMIC • 12090 South Memorial Parkway • Huntsville, Alabama 35803-3308 1 VMIVME-5550 DATA TRANSFERS INTERRUPT TRANSFERS — In addition to transferring data between nodes, the VMIVME-5550 will Data written into the Reflective Memory is broadcast to allow any processor in any chassis to generate a VMEbus all nodes on the network without further involvement of interrupt on any other chassis. These interrupts would the sending or receiving nodes. Data is transferred from generally be used to indicate to the receiving chassis that new memory locations on the sending nodes to data has been sent and is ready for processing. These corresponding memory locations on the receiving nodes. interrupts are also used to indicate that processing of old data is completed and the receiving chassis is ready for new data. A functional block diagram of the VMIVME-5550 is shown in Figure 2. Three interrupts are available. The user may define the function, priority, and vector for each interrupt. Any processor can generate an interrupt on any other VMEbus on PRODUCT OVERVIEW — The Reflective Memory the network on which the same interrupt is not already concept provides a very fast and efficient way of sharing data pending. In addition, any processor on the network can across distributed VMEbus computer systems. generate an interrupt on all VMEbuses on the network VMIC’s VMIVME-5550 Reflective Memory interface simultaneously. Interrupts are generated by simply writing to allows data to be shared between up to 16 independent a single VMIVME-5550 register. VMEbus systems (nodes) at rates up to 20 Mbyte/s. Each ERROR DETECTION AND RECOVERY — When Reflective Memory board may be configured with 256 Kbyte Node 0 detects that there has been no activity on the link for to 4 Mbyte of on-board SRAM. The local SRAM provides more than 5 µs, it takes control of the link and passes control fast Read access times to stored data. Writes are stored in to the next node in the round robin sequence. As a result, local SRAM and broadcast over a high-speed parallel data node failures or nodes with power loss (except Node 0) will bus to other Reflective Memory nodes. The transfer of data not prevent the link from operating. between nodes is software transparent, so no I/O overhead is required. Transmit and Receive FIFOs buffer data during It is possible for the output buffer to become full. An peak data rates to optimize CPU and bus performance to interrupt is available to signal the buffer is half full. A bit in maintain high data throughput. a Status Register is also available to indicate when the buffer is full. The user can use any combination of the facilities to The Reflective Memory also allows interrupts to one or prevent overfilling the buffer. An attempt to write to the more nodes by writing to a byte register. VMIVME-5550 memory when the output buffer is full will These interrupt (three level, user definable) signals may result in the generation of BERR to prevent data loss. be used to synchronize a system process, or used to follow Table 1. Recommended Data Rate Versus Cable any data that may have preceded it. The interrupt always Length follows the data to ensure the reception of the data before the interrupt is acknowledged. Data Rate Data Rate 1 Mbyte, 512 Kbyte, and 256 Kbyte VMIVME-5550 Transfers/s Bytes/s Length (32-bit Cable boards may be intermixed on the same link since all of these (32-bit Cable (feet) Transfers) options pass a 1 Mbyte relative address across the link. The 4 Transfers) and 2 Mbyte VMIVME-5550 boards should not be mixed 0 to 50 5 M longwords 20 Mbyte with the 1 Mbyte, 512 Kbyte, or 256 Kbyte since they pass a 4 Mbyte relative address across the link. The 4 and 2 Mbyte 50 to 100 2.5 M longwords 10 Mbyte VMIVME-5550 boards may be intermixed on the same link. 101 to 250 1.25 M longwords 5 Mbyte LINK ARBITRATION — Node addresses are set by on-board jumpers and may be read in the Status Register. 251 to 1,000 .625 M longwords 2.5 Mbyte Node 0 is the network arbiter. Control of the link is passed from the Node 0 to all other nodes on the network in a round robin fashion. As each node receives control of the link, it broadcasts all data written to its memory since the last time it TRADEMARKS had control of the link. This data is contained in the node’s output buffer. After the entire contents of the output buffer is The VMIC logo is a registered trademark of VMIC. broadcast, control of the link is passed back to Node 0. Node Other registered trademarks are the property of their 0 then broadcasts the contents of its output buffer and passes respective owners. control to the next node on the link. 2 For Ordering Information, Call: 1-800-322-3616 or 1-256-880-0444 • FAX (256) 882-0859 VMIVME-5550 C M 5 I I I 5 5 P E 5 / / / 5 5 U M O O O 0 5 5 0 5 5 5 5 0 0 VME CHASSIS VME COMPUTER* WORKSTATION* VME COMPUTER* NODE 0 NODE 1 NODE 2 NODE 16 * Nodes can be VMEbus-based computers or computers with VMEbus I/O channels, such as Sun, Harris Night Hawk, Concurrent, Silicon Graphics, Data General, Motorola Delta Series, Encore 91 Series, and VMEbus chassis, etc. Figure 1. Typical Network Using Reflective Memory VMIC • 12090 South Memorial Parkway • Huntsville, Alabama 35803-3308 3 VMIVME-5550 BROADCAST CABLE 60 DIFFERENTIAL PAIR DIFFERENTIAL RCVR/DRVR 4 Kbyte 4 Kbyte INT1 DEEP DEEP 7 LINES BIM • OUT IN • INT INT7 5 LINES FIFO FIFO CTRL CTRL CTRL IACK ADDR BIM CTRL IACK* FIFO/RCV CTRL 17 CS IACK IN* RAM CTRL VMEbus WR IACK OUT* LOGIC DECODE RAM CONTROL CONTROL SIGNALS AND (256 Kbyte x 8) SELECT LINES ADDR or LATCH 31 LINES (1 M x 8) VME ADDR A1 TO A31 22 LINES ENABLE/DIR 32 LINES VME VME 32 LINES DATA BUS DATA D31 TO D0 BUS BUFFER Figure 2. VMIVME-5550 Functional Block Diagram 4 For Ordering Information, Call: 1-800-322-3616 or 1-256-880-0444 • FAX (256) 882-0859