Description
The XVME-674 RAM/ROM Memory Modulc is a singlc-high, VMEbus compatiblcboard,which can accommodate upto IMbyte Of RAM,EPROM,or maskprogrammablc ROM or 256K bytes of EEPROM, The modulc is designcd with an on.board battery backup circuit to provide power to CMOS RAM devices in the cventof a power failure.
The XVME-100 has eight 28/32-pin JEDEC sockets which are logically arranged as 2banks of 4 sockets cach, Each bank is designed to employ memory devices o’ thcsame type and speed,and each bank can be independently configured (.ia jumpers)in terms of:
VME Address/Memory Chip SizeAddress Modifier DecodeMcmory Deviee SpeedMemory Deviee PinoutMemory Backup Power
The XVME-100 RAM/ROM Memory Module has power down protection circuitrywhich prevents data from being written to memory when the voltage falls below4.75 Volts. The modulc also has the option of asserting SYSRESET under thiscondition.
1.2MANUAL STRUCTURE
The purpose ofthis first chapter is to introducc the user to the generalspccifications and functional capabilities of the XVME-100. Successive chapters wildevclop the various aspects of module installation and opcration in the followingprogression:
The Xycom Automation XVME-100 and XVME-401Quad Serial 1/0 Modules are single-high, single-wideVMEbus modules that provide a VMEbus system withfour serial communication channels. The XVME-400and XVME-401 differ only in their communicationinterface: the XVME-400 provides four RS-232C serialports, while the XVME-401 provides fourRS-422ARS-485 serial ports.
Both modules contain two Z8530 Serial Communica-tion Controller (SCC) chips which provide a variety ofcommunication modes, including asynchronous, byte-synchronous, and bit-oriented protocols. Each channelis independently programmable and has its own baudrate generator and modem signal controls.The VMEbus interface directly maps the Z8530 SCCchips into the short //O address space, starting on ajumper-selected 1 Kbyte boundary. The modules canalso be jumpered to generate an interrupt on any oftheseven VMEbus interrupt levels. The two Z8530 SCCchips can generate a total of 16 different interruptvectors.
For applications not allowing //O to be routed out thefront panel, the XVME-490 and XVME-49l offer thesame functionality as the XVME-100 and XVME-401In a 6U form factor, the lO is routed via the VMEbusP2 connector on the back of the board.
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