ICS TRIPLEX T8100 Channel isolation module

A “Break” is generated by pressing and releasing the BREAK key on the terminal keyboard. Break does not generate an interrupt. The only time break is recognized is when characters are sent or received by the console port. Break removes any breakpoints in your code and keeps the breakpoint table intact. Break also takes a snapshot of the machine state if the function was entered using SYSCALL. This machine state is then accessible to you for diagnostic purposes. Many times it may be desirable to terminate a debugger command prior to its completion; for example, during the display of a large block of memory. Break allows you to terminate the command.

SYSFAIL* Assertion/Negation 

Upon a reset/powerup 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. Refer to Chapter 3.

MPU Clock Speed Calculation 

The clock speed of the microprocessor is calculated and checked against a user definable parameter housed in NVRAM (refer to the CNFG command). If the check fails, a warning message is displayed. The calculated clock speed is also checked against known clock speeds and tolerances.

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