User`s manual

Restarting the System

1-20

Abort

Abort is invoked by pressing and releasing the ABORT switch.

Whenever abort is invoked while executing a user program

(running target code), a snapshot of the processor state is captured

and stored in the target registers. (When working in the debugger,

abort captures and stores only the Instruction Pointer, status

is most appropriate when terminating a user program that is being

debugged. Abort should be used to regain control if the program

gets caught in a loop. The target IP and register contents help to

pinpoint the malfunction.

Pressing and releasing the

ABORT switch generates a local board

condition which interrupts the microprocessor. The target registers,

reflecting the machine state at the time the abort switch was

pressed, are displayed on the screen. Any breakpoints installed in

the user code are removed, and the breakpoint table remains intact.

Control is returned to the debugger.

Note You may wish to perform Òdouble-button resetÓ by

pressing the

RESET and ABORT switches at the same

time. Release

RESET first, wait seven seconds, and then

release

ABORT. This resets all onboard devices, as well

as sending a SYSRESET* signal if the board is the

VMEbus system controller. It also ignores the

parameters stored in NVRAM, and starts debugger

execution with the same ENV parameters as if you had

used the command ENV;D.