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4
Section
FUNCTIONAL SUMMARY
"RUN" Indicator
The "RUN" indicator is a green LED which is illuminated whenever the module microprocessor is not
reset and not halted.
"FAULT" Indicator
The "FAULT" indicator is a red LED, under program control, which provides a visual indication to the
user that the software has detected an error condition and the VMEbus signal SYSFAIL* is asserted.
"VME" Indicator
This green indicator is illuminated during the period of a VMEbus master access attempt. The LED illu-
mination intensity is a relative indication of the PT-VME161's VMEbus access frequency. A solid,
bright light is indicative of high bus contention where the PT-VME161 is not receiving a Bus Grant.
RESET Switch
The reset switch is a red push button on the front panel which is tied to the EXTRST input pin of the ACC
which in turn generates a board reset [-LRST].
ABORT Switch
The abort switch is a black push button on the front panel which is tied to the -L7I0(NMI) input pin of
the SCV64 which in turn will generate a level 7 interrupt to the 68060.
User Programmable LEDs
Four user programmable LEDs are available on the front panel, labeled D0, D1, D2, and D3. They are
programmed by software through bits in the System Control Register.
74 Extensible Single Board Computer/Controller User's Manual
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