PCM-SX 386SX Single Board Computer PC/104 MODULE FEATURES � 33 MHz 386SX PC/104 single board computer � Low power and low cost � PC-AT software compatible � Up to 8Mbytes of surface mounted DRAM � Solid state disk socket supports onboard bootable 32-pin DIP Flash, SRAM or (EP)ROM � Up to 288MB Flash Disk with flash file system � Industry standard BIOS with POST � 16-bit PC/104 bus expansion connector � Two serial ports with FIFOs: COM1 and COM2 with RS-232, optional RS-422/485 for both channels � Bidirectional LPT port that supports EPP/ECP � Watchdog timer and power fail reset � 16-bit IDE interface & floppy controller � Two interrupt controllers and 7 DMA channels � Three 16-bit counter/timers � AT keyboard controller Memory - Up to 8Mbytes of surface mounted dynamic � Real-time clock with battery backup RAM is populated on the board. These parts are sol- � Status and hard disk activity LEDs dered directly into the board to improve reliability for � Speaker port with onboard piezo transducer applications subject to shock and vibration. � Small size: 3.6 x 3.8 inches (90mm x 96mm) � +5 volt only operation The PCM-SX is shipped from the factory with an indus- o o � Operating temperature: -40 C to +85 C try standard BIOS installed in a 128KB EPROM. At reset, the BIOS is shadowed into the DRAM so that it will exe- WinSystems’ PCM-SX is a compact, 386SX compatible, cute faster. single board computer (SBC) for embedded designers. It is an ideal solution where PC-AT power, performance Solid State Disks (SSD) - A user can substitute on-board and compatibility are needed in space- and budget-limit- semiconductor devices for applications where the envi- ed industrial applications. ronment is too harsh for mechanical hard disks or flop- py disk drives while offering significant speed advan- Even though the board is PC-AT compatible, it will oper- tages. ate without disks, keyboard or a monitor. The PCM-SX is well suited for portable and mobile products because One 32-pin socket supports a SRAM, EPROM, PEROM ® of its compact size, processing performance, +5 volt or DiskOnChip. Device sizes are 512K x 8 for the only operation and low power requirements. SRAM, EPROM and PEROM. Also, a 1M x 8 EPROM can be used in the socket. The PCM-SX can operate as a standalone SBC or expand- ® ed with PC/104 modules to meet the system hardware Flash Disk - A 32-pin DiskOnChip Flask disk is sup- configuration requirements. ported but not populated. It is a 32-pin device that ® offers 8 to 288Mbyte capacity and includes TrueFFS, an FUNCTIONAL CAPABILITY embedded flash file system. The file system provides hard disk read/write compatibility, automatic bad block Processor - The PCM-SX module operates at 33 MHz. management and wear leveling. The processor and core logic chip set are integrated into a highly efficient single device that includes the DRAM ROMDISK - A diskette imaging program called controller, bus interface and integrated peripheral con- MKDISK is provided to simplify the creation of a troller. The AT peripherals include two 8237 DMAs, bootable ROMDISK made from a floppy diskette. Since 8254 timer, two 82C59 interrupt controllers, keyboard the bootable ROMDISK is an exact image of a bootable controller, real time clock and CMOS memory. floppy diskette, all testing and debugging can be accom- 3.5” and 5.25” Floppy Disk Support - Up to 2 floppy disk drives are supported by the on-board controller which provides access via a standard 34-pin connector. Serial Communications - Two independent, double- buffered, full-duplex, asynchronous serial channels with FIFOs are supported. This device is a dual 16550 that offers software compatibility with PC-type driver pro- grams. They are mapped at COM1 and COM2 (3F8-3FF and 2F8-2FF hex) respectively. Independent control of transmit, receive, line status and data set interrupts are on both channels. Each channel is setup to provide internal diagnostics such as loopback and echo mode on the data stream. The unit contains two independent on-chip software programmable baud rate generators selectable from 50 through 115.2Kbits per second. Individual modem handshake control signals are sup- ported for both channels. RS-232 interface levels are supported on both channels. The RS-232 drivers have an on-chip charge pump to generate the plus and minus voltages so that the PCM- SX only requires +5 volts to operate. CBL-247-1 COM1 & COM2 RS-232 Pin-Out PCM-SX BLOCK DIAGRAM Pin Flow Signal plished by using a floppy drive. Once the application is 1 IN Data Carrier Detect (DCD) ready for ROM, it is a simple matter to use the MKDISK 2 IN Receive Data (RxD) 3 OUT Transmit Data (TxD) utility to create the EPROMs necessary for a bootable 4 OUT Data Terminal Ready (DTR) ROMDISK equivalent of the functioning floppy. 5 — Signal Ground (GND) 6 IN Data Set Ready (DSR) 7 OUT Request To Send (RTS) RAMDISK - A RAMDISK is available as a bootable de- 8 IN Clear To Send (CTS) vice using the BIOS extension or as a non-bootable disk 9 IN Ring Indicator (RI) by using an installable device driver. By using the stan- dard MS-DOS Format program, a bootable RAMDISK can Optionally, both RS-422 or RS-485 electrical levels can be created in a floppy disk size of up to 512KB. Either be supported on both COM1 and COM2 by removing a 512KB SRAM or Atmel PEROM (Flash) device is sup- the RS-232 transceivers and installing the optional CK- ported. 75176 chip kit. The RS-422/485 configuration provides separate balanced transmit and receive signal pairs. For WinSystems provides an installable device driver called RS-485 multi drop lines, one signal pair can be used for USSD.SYS for use with MS-DOS and ROM-DOS operat- “party line” network structures. ing systems. It supports disk sizes up to 1MB onboard and up to 16MB off board when using the PCM-SSD Both serial channels are configured as Data Terminal PC/104 modules. The driver supports both PEROMs Equipment (DTE) and wired to a 50-pin connector at (Atmel +5 Flash) and battery backed SRAMs in the the edge of the board. WinSystems offers the optional socket. CBL-247-1 which adapts each serial channel to 9-pin male “D” connectors with PC-AT compatibility. Direct Memory Access (DMA) - Seven DMA channels are supported. Channel 2 is dedicated to the floppy Line Printer Port - The PCM-SX contains a port that is disk controller, and the other channels are wired to the configured as a bidirectional EPP/ECP printer port PC/104 connector. mapped at LPT1 (278-27F hex). Alternatively, it can be configured as two additional general purpose I/O ports 16-Bit IDE Hard Disk Interface - A 40-pin header con- if a printer is not required. The first port is configured nector handles all command, data and status I/O lines to as 8 input or output only lines. The other port is con- an industry standard IDE interface. A status LED pro- figured as 5 input and 3 output lines. vides a visual status during data transfers. CBL-247-1 LPT Connector Pin-Out the clock section. The remaining 114 bytes of RAM holds all of the DOS setup information regarding hard Pin Flow Signal and floppy disk types, video types, shadowing, wait 1 I/O Strobe states, etc. 2 I/O Data Bit 0 3 I/O Data Bit 1 4 I/O Data Bit 2 Watchdog Timer - A software/hardware enabled, re- 5 I/O Data Bit 3 triggerable watchdog timer is provided. This timer must 6 I/O Data Bit 4 7 I/O Data Bit 5 be updated at least once every 1.5 seconds otherwise a 8 I/O Data Bit 6 failure is assumed and the board will be reset. This cir- 9 I/O Data Bit 7 cuit is important for use in remote and unattended 10 IN Acknowledge 11 IN Busy applications. 12 IN Paper End 13 IN Select Reset - A precision voltage comparator monitors the +5 14 OUT Autofeed 15 IN Error volt status. Upon detection of an out-of-tolerance con- 16 OUT Init. Printer dition, the board is reset. This action is critically impor- 17 OUT Select Input tant in order to detect brown-out or power fail condi- 18-25 — Ground tions. The reset circuit also ensures that the power is nominal before executing a power-on reset. This circuit The LPT signal lines are wired to a 50-pin right angle also inhibits the processor’s memory write line, pre- connector. WinSystems’ CBL-247-1 adapts the signals to venting invalid data from being written to battery a 25-pin female “D” socket connector with strain relief. backed static RAMs or EEPROMs during power fluctua- tions. Keyboard Controller - An integrated 80C42 equival- ent keyboard controller supports a PC/AT-type key- Battery Back-up - A 125 mAH battery supplies the PCM- board. It is accessed via the CBL-247-1 Multi-I/O SX board with standby power for either or both SRAM adapter cable. memory sockets, the real time clock and CMOS set-up RAM. CBL-247-1 Keyboard Female Connector Pin-Out Pin Signal A power supervisory circuit contains the voltage sens- ing circuit and an internal power switch to route the 1 Keyboard Clock 2 Keyboard Data battery or stand-by voltage to the circuits selected for 3 N/C backup. The battery automatically switches ON when 4 Ground the Vcc of the system drops below the battery voltage 5 +5 volts and back OFF again when Vcc returns to normal. Status LED - A status LED is available on the board to Speaker - An onboard piezo transducer is provided for monitor system activity. Under program control, it can sound generation. A beep code will be generated cor- indicate error conditions or blink different patterns to responding to the BIOS error codes (if required) during provide a visual indication of program status. There is the power-up or reset sequence. also an activity LED on the IDE interface that blinks indicating data transfer in process. PC/104 Bus - The PCM-SX board is available with a 16- bit, stackthrough or non-stackthrough, PC/104 Bus con- Interrupts - Two 82C59A compatible interrupt con- nector. This allows multiple PC/104 modules to plug trollers accept inputs from the onboard peripherals together to support video, LANs, analog, digital and and the PC/104 Bus for a total of twelve selectable inter- other special purpose I/O functions. rupt sources. Power - Power is brought into the board through an Timers - Three 82C54 compatible 16-bit timers are 8-pin connector. The +12 volts is wired directly to the supported. Channel 0 is wired to interrupt channel 0, PC/104 connector and is not used by the PCM-SX. channel 1 generates the DRAM refresh using DMA chan- nel 0 and channel 2 is used by the speaker port. I/O Connector - WinSystems offers an optional Multi- I/O cable for the COM1, COM2, LPT1 and keyboard. Real Time Clock/Calendar - A MC146818A compatible These four ports are combined into one 50-pin header clock supports a number of features including at the board’s edge. The CBL-247-1 is a 1 foot periodic and alarm interrupt capabilities. In addition adapter cable that offers a more convenient ter- to the time and date keeping functions, the system mination. COM1 and COM2 are 9-pin male “D” con- configuration is kept in CMOS RAM contained within nectors with strain relief. LPT1 is a 25-pin “D” female socket with strain relief. The keyboard is a 5-pin DIN SPECIFICATIONS connector. Electrical PCM-SX CPU Clock: 33 MHz PC/104 Interface: 16-bit, non-stackthrough 16-bit, stackthrough version Serial Interface: 2 Serial channels with RS-232 levels RS-422/485 optional using the CK-75176 kit. LPT Interface: Bidirectional line printer/EPP/ECP IDE Interface: 16-bit, supports 2 drives Floppy Disk Interface: BIOS supports one or two Drawing of CBL-247-1 360K/720K/1.2M/1.44M drives Vcc=+5V ±5% at 375 mA typ: PCM-SX-33-2M SOFTWARE SUPPORT System Memory The PCM-SX is designed to support both full PC-AT DOS Addressing: 16 Megabytes compatible and embedded systems applications. An Capacity: 2, 4, or 8 MB of surface mount DRAM industry standard BIOS is supplied that provides config- uration flexibility, performance and AT compatibility. Solid State Disk It supports both 3.5 inch and 5.25 inch floppy disk Capacity: One 32-pin memory socket supports up to drives, AT-compatible keyboards and other standard 512KB SRAM or Atmel Flash, 1MB BIOS features. The BIOS also provides set up, power-on ® EPROM, or up to 48MB DiskOnChip self test and boot diagnostics in ROM. Mechanical DOS - Since the PCM-SX is software compatible with Dimensions: 3.6” x 3.8” (90 mm x 96 mm) the PC-AT, it will run the latest versions of DOS, Linux, Weight: 2.5oz. (70gm) Windows and OS/2. It will support other operating sys- tems such as QNX and real-time executives that require Connectors a “PC-AT” hardware environment. Serial, Parallel, Keyboard: 50-pin 0.100” grid Floppy Disk Interface: 34-pin 0.100” grid Software Developers Kit - WinSystems offers the SDK2- IDE Interface: 40-pin 0.100” grid PCM-104 software developers kit to supply the neces- PC/104 Bus: 64-pin 0.100” socket sary hardware, software and cables to begin program 40-pin 0.100” socket development with the PCM-SX board. It consists of Power: 8-pin in-line Molex Microsoft DOS 6.x, CBL-247-1 Multi-I/O cable, a 2GB or larger hard disk plus controller cable, an 1.44MB high Environmental o o ,, density 3.5 inch floppy disk plus controller cable and Operating Temperature: -40 C to +85 C triple output power supply housed in an enclosure. This packaging permits easy access to the board, ORDERING INFORMATION PC/104 modules, and peripherals during program devel- opment. PCM-SX-33-2M 2MB, 33 MHz, PC/104 SBC PCM-SX-33-2M-ST Stackthrough connector version ROM-DOS Developers Kit (RDK) - WinSystems also PCM-SX-33-4M 4MB, 33 MHz, PC/104 SBC offers several different Flash-based developers kits for PCM-SX-33-4M-ST Stackthrough connector version those applications that do not need rotational media PCM-SX-33-8M 8MB, 33 MHz, PC/104 SBC during development. When you order a PCM-SX along PCM-SX-33-8M-ST Stackthrough connector version with the RDK of your choice, WinSystems will jumper RDK-PCM-249-XF ROM-DOS Developers Kit the CPU, program and install the Flash part to your SDK-PCM-104 Software Developers Kit ®, PCM-SX. The RDK includes a PS-50W-1, PCM-POST, FLASH-MD2000-DXX DiskOnChip2000 where XX = Flash memory, ROM-DOS, cables and utility software. 8MB to 288MB memory storage CBL-174-1 Power cable for the board CBL-247-1 1 ft., Multi-I/O adapter cable CK-75176-2 RS-422/485 chip kit for 1 channel 715 Stadium Drive • Arlington, Texas 76011 • (817) 274-7553 • http://www.winsystems.com