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Debugger General Information
SYSFAIL* Assertion/Negation
B
MPU Clock Speed Calculation
B-10
Upon a reset/power-up condition the debugger asserts the
VMEbus SYSFAIL* line (refer to the VMEbus specification).
SYSFAIL* stays asserted if any of the following has occurred:
Confidence test failure
NVRAM checksum error
NVRAM low battery condition
Local memory configuration status
Self test (if system mode) has completed with error
MPU clock speed calculation failure
After debugger initialization is done and none of the above
situations have occurred, the SYSFAIL* line is negated. This
indicates to the user or VMEbus masters the state of the debugger.
In a multi-computer configuration, other VMEbus masters could
view the pertinent control and status registers to determine which
CPU is asserting SYSFAIL*. SYSFAIL* assertion/negation is also
affected by the ENV command.
The clock speed of the microprocessor is calculated and checked
against a user definable parameter housed in NVRAM (refer to the
CNFG command in the Commands Table). If the check fails, a
warning message displays. The calculated clock speed is also
checked against known clock speeds and tolerances.
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