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Startup and Operation
2
You will need to reset your system if the processor ever halts, or if the
177Bug environment is ever lost (vector table is destroyed, stack
corrupted, etc.).
Abort
Aborts are invoked by pressing and releasing the
ABORT
switch on the
MVME177P front panel. When you invoke an abort while executing a user
program (running target code), a snapshot of the processor state is stored
in the target registers. This characteristic makes aborts most appropriate
for terminating user programs that are being debugged.
If a program gets caught in a loop, for instance, aborts should be used to
regain control. The target PC, register contents, etc., help to pinpoint the
malfunction.
Pressing and releasing the
ABORT
switch generates a local board condition
which may interrupt the processor if enabled. The target registers,
reflecting the machine state at the time the
ABORT
switch was pressed, are
displayed on the screen. Any breakpoints installed in your code are
removed and the breakpoint table remains intact. Control returns to the
debugger.
Break
Pressing and releasing the <BREAK> key on the terminal keyboard
generates a ‘‘power break’’. Breaks do not produce interrupts. The only
time that breaks are recognized is while characters are being sent or
received by the console port. A break removes any breakpoints in your
code and keeps the breakpoint table intact. If the function was entered
using SYSCALL, Break also takes a snapshot of the machine state. This
machine state is then accessible to you for diagnostic purposes.
In many cases, you may wish to terminate a debugger command before its
completion (for example, during the display of a large block of memory).
Break allows you to terminate the command.
Summary of Contents for MVME177P
Page 1: ...MVME177P Single Board Computer Installation and Use V177PA IH1 Edition of October 2000 ...
Page 10: ...x ...
Page 12: ...xii ...
Page 14: ...xiv ...
Page 34: ...1 16 Computer Group Literature Center Web Site Hardware Preparation and Installation 1 ...
Page 48: ...2 14 Computer Group Literature Center Web Site Startup and Operation 2 ...
Page 92: ...C 2 Computer Group Literature Center Web Site Network Controller Data C ...
Page 98: ...D 6 Computer Group Literature Center Web Site Disk Tape Controller Data D ...
Page 108: ...Index IN 6 Computer Group Literature Center Web Site I N D E X ...