ABB HC800 Communication interface module

Whether the MVME187 operates as a VMEbus master or as a VMEbus slave, it is configured for 32 bits of address and for 32 bits of data (A32/D32). However, it handles A16 or A24 devices in certain address ranges. D8 and/or D16 devices in the system must be handled by the MC88100 software. Refer to the memory maps in the Single Board Computer Programmer's Reference Guide as listed in Related Documentation in Chapter 1. DRAM Addressing The MVME187 contains shared onboard DRAM whose base address is software-selectable. Both the onboard processor and offboard VMEbus devices see this local DRAM at base physical address $00000000, as programmed by the MVME187Bug firmware. This may be changed, by software, to any other base address. Refer to the Single Board Computer Programmer's Reference Guide for details.

Global Bus Timeout

 If the MVME187 tries to access offboard resources in a non-existent location, and is not system controller, and if the system does not have a global bus timeout, the MVME187 waits forever for the VMEbus cycle to complete. This would cause the system to hang up.

Multiple MVME187s may be configured into a single VME card cage. In general, hardware multiprocessor features are supported. GCSR Location Monitor Register Other MPUs on the VMEbus can interrupt, disable, communicate with and determine the operational status of the RISC processor(s). One register of the GCSR set includes four bits which function as location monitors to allow one MVME187 processor to broadcast a signal to other MVME187 processors, if any. All eight GCSR registers are accessible from any local processor as well as from the VMEbus.

Ethernet LAN (+12 Vdc) Fuse

 The MVME187 provides +12 Vdc power to the Ethernet LAN transceiver interface through a 1-amp fuse (F2) located on the MVME187. The +12V LED lights when +12 Vdc is available. The fuse is socketed and is located adjacent to diode CR1 near connector P1. If the Ethernet transceiver fails to operate, check the fuse. When using the MVME712M transition module, the yellow LED (DS1) on the MVME712M front panel lights when LAN power is available, indicating that the fuse is good.

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