SST SST-PB3-PCU Logic operation module

Whenever abort is invoked while running target code (a user program), a “snapshot” of the processor state is captured and stored in the target registers. For this reason, abort is most appropriate when terminating a user program that is being debugged. The target IP, register contents, etc., help to pinpoint the malfunction. Abort Sequence Pressing and releasing the ABORT switch does the following: 1. Generates a local board condition which may interrupt the processor if enabled. 2. Displays the target registers on the screen, reflecting the machine state at the time the ABORT switch was pressed. 3. Removes any breakpoints installed in the user code and keeps the breakpoint table intact. 4. Returns control to the debugger. Abort is invoked by pressing and releasing the ABORT switch on the MVME187 front panel. Abort should be used to regain control if the program gets caught in a loop, etc.

A “Break” is generated by pressing

 and releasing the BREAK key on the console 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. 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.

Break Sequence 1. Removes any breakpoints in your code and keeps the breakpoint table intact. 2. 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.

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 Appendix A.

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