RELIANCE 45C554 Channel isolation card

Input/Output (I/O) signals are routed through industry-standard connectors on the MVME172LX front panel; no adapter boards or transition modules are required. I/O connections include an optional 68-pin SCSI connector, an optional DB-15 Ethernet connector, and four 8-pin RJ-45 serial connectors on the front panel. In addition, the panel has cutouts for routing of flat cables to the optional IndustryPack modules. The following ASICS are used on the MVME172LX: ❏ VMEchip2. (VMEbus interface). Provides two tick timers, a watchdog timer, programmable map decoders for the master and slave interfaces, and a VMEbus to/from local bus DMA controller, a VMEbus to/from local bus non-DMA programmed access interface, a VMEbus interrupter, a VMEbus system controller, a VMEbus interrupt handler, and a VMEbus requester.

Processor-to-VMEbus transfers are D8, D16, or D32. 

VMEchip2 DMA transfers to the VMEbus, however, are D16, D32, D16/BLT, D32/BLT, or D64/MBLT. 

❏ MC2chip. Provides four tick timers, the interface to the LAN chip, SCSI chip, serial port chip, BBRAM, EPROM/Flash, parity-DRAM and SRAM. 

❏ MCECC memory controller. Provides the programmable interface for the ECC-protected 16MB DRAM mezzanine board. 

❏ IndustryPack Interface Controller (IP2). The IP2 provides control and status information for up to two single-wide IPs or one double-wide IP that can be plugged into the MVME172LX main board.

Data Bus Structure

 The local bus on the MVME172LX is a 32-bit synchronous bus that is based on the MC68060 bus, and which supports burst transfers and snooping. The various local bus master and slave devices use the local bus to communicate. The local bus is arbitrated by priority type; the priority of the local bus masters from highest to lowest is: 82596CA LAN, 53C710 SCSI, VMEbus, and MPU. As a general rule, any master can access any slave; not all combinations pass the common sense test, however. Refer to the MVME172 VME Embedded Controller Programmer’s Reference Guide and to the user’s guide for each device to determine its port size, data bus connection, and any restrictions that apply when accessing the device.

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