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Functional Description
Reset and Abort Header (J21)
3
Front Panel Indicators (DS1 - DS4)
3-22
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 header.
There are four LEDs on the MCP750HA front panel:
❏
(DS2, yellow). Board Failure; lights when the
BFL
line is active.
❏
(DS4, green). CPU activity; lights when the
CPU
Busy) signal line on the processor bus is active.
❏
(DS3, green). PCI activity; lights when the
PCI
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
Ready) signal line on the CPCI bus is active. This indicates that the
CPCI bus is active.
Assignments, for the definition of pin
IRDY
Computer Group Literature Center Web Site
∗
signal
BRDFAIL
∗
(Data Bus
DBB
∗
(Initiator
(Initiator
IRDY*
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