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Other MPUs on the VMEbus can interrupt, disable, communicate with,
and determine the operational status of the processor(s). One register of the
GCSR (global control/status register) set in the VMEchip2 ASIC includes
four bits that function as location monitors to allow one MVME172P4
processor to broadcast a signal to any other MVME172P4 processors. All
eight registers of the GCSR set are accessible from any local processor as
well as from the VMEbus.
The following circuits are protected by solid-state fuses that open during
overload conditions and reset themselves once the overload is removed:
IndustryPack +5V (F1, F6)
Remote reset connector +5V (F2)
LAN AUI +12V (F3)
IndustryPack ±12V (F4, F5)
The
FUSE
MVME712M module is used, the yellow DS1 LED on the MVME712M
illuminates on availability of LAN power, signifying that the fuse is good.
If the Ethernet transceiver fails to operate, check fuse F3.
The MVME172P4 provides SCSI terminator power through a 1A fuse (F1)
located on the P2 Adapter Board or LCP2 Adapter Board. If the fuse is
blown, the SCSI device(s) may function erratically or not at all. When the
P2 Adapter Board is used with an MVME712M and the SCSI bus is
connected to the MVME712M, the green DS2 LED on the MVME712M
front panel illuminates on availability of SCSI terminator power. If the
green DS2 LED flickers during SCSI bus operation, check P2 Adapter
Board fuse F1.
If a solid-state fuse opens, you will need to remove power for several
minutes to let the fuse reset to a closed or shorted condition.
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LED illuminates to indicate that +12 Vdc is available. When an
Installation Instructions
1-27
1
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