Front Panel Indicators (Ds1 - Ds4) - Motorola MVME177 Installation And Use Manual

Front Panel Indicators (DS1 - DS4)

There are eight LEDs on the MVME177 front panel: FAIL, STAT,
RUN, SCON, LAN, +12V (LAN power), SCSI, and VME. The
purpose of each LED is as follows:
The red FAIL LED (part of DS1) lights when the BRDFAIL
signal line is active
The MC68060 status lines are decoded, on the MVME177, to
drive the yellow STAT (status) LED (part of DS1). In this case,
a halt condition from the processor lights the LED
The green RUN LED (part of DS2) lights when the local bus
TIP* signal line is low. This indicates one of the local bus
masters is executing a local bus cycle
The green SCON LED (part of DS2) lights when the
VMEchip2 in the MVME177 is the VMEbus system controller
The green LAN LED (part of DS3) lights when the LAN chip
is local bus master
The MVME177 supplies +12V power to the Ethernet
transceiver interface through a fuse. The green +12V (LAN
power) LED (part of DS3) lights when power is available to
the transceiver interface
The green SCSI LED (part of DS4) lights when the SCSI chip
is local bus master
The green VME LED (part of DS4) lights when the board is
using the VMEbus (VMEbus AS* is asserted by the
VMEchip2) or when the board is accessed by the VMEbus
(VMEchip2 is the local bus master)
Controls and Indicators
3-3
3