3-22
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Functional Description
3
Reset and Abort Header (J21)
A three pin header is provided to facilitate remote reset and abort
operations. Connection to J21 will allow external stimulation of the Reset
and Abort signal lines just as if the front panel switches were depressed.
Refer to
Chapter 4, Connector Pin Assignments
, for the definition of pin
assignments for the header.
Front Panel Indicators (DS1 - DS4)
There are four LEDs on the MCP750HA front panel:
❏
BFL
(DS2, yellow). Board Failure; lights when the
BRDFAIL
∗
signal
line is active.
❏
CPU
(DS4, green). CPU activity; lights when the
DBB
∗
(Data Bus
Busy) signal line on the processor bus is active.
❏
PCI
(DS3, green). PCI activity; lights when the
IRDY
∗
(Initiator
Ready) signal line on the PCI bus is active. This indicates that the
local PCI bus is active.
❏
CPCI (DS1, green). CPCI activity; lights when the
IRDY*
(Initiator
Ready) signal line on the CPCI bus is active. This indicates that the
CPCI bus is active.