Motorola MVME166IG/D2, MVME166D2 manual Installation Instructions

Installation Instructions

Other MPUs on the VMEbus can interrupt, disable, communicate with and determine the operational status of the processor(s). One register of the GCSR set includes four bits which function as location monitors to allow one MVME166 processor to broadcast a signal to other MVME166 processors, if any are present. All eight registers are accessible from any local processor as well as from the VMEbus.

The MVME166 provides +12 Vdc, -12 Vdc, and +5 Vdc power to the transition modules through fuses F1, F3, and F4. The fused +5 Vdc power is also provided to the 20-pin remote reset connector. These voltage sources are used by the transition modules to power the serial port drivers and any LAN transceivers connected to the transition module. The RPWR LED (DS3) on the MVME166 front panel lights when all three voltages are available.

The MVME166 provides +5 Vdc to the SCSI bus TERMPWR signal through fuse F2, located near the front panel SCSI bus connector. The TPWR LED (DS5) on the MVME166 front panel monitors the SCSI bus TERMPWR signal; when the MVME166 is connected to an SCSI bus, either directly or via the MVME712-07 module, the TPWR LED lights when there is SCSI terminator power. Because any device on the SCSI bus can provide TERMPWR, the LED does not directly indicate the condition of the fuse. If the LED is not illuminated during SCSI bus operation, the fuse should be checked.

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MVME166IG/D2 2-9