GE Energy Services
68K System Monitor
User's Guide
SWM0023 1.00 2 General
3-28 Full Release
DM - Debug Mode
Platform þCPM þD20
D20 Base þD20 ME
D20 Base oD20/200
CCU Base oD20/200 ME
CCU Base oD25
Description Use this command to enable or disable product-specific debugging modes.
• For the 68020, (D20M) and 68EC030 (D20 ME) it disables the on-chip
instruction cache.
• For the 68332, (CPM) it enables show cycles.
When enabled, both of these debug mode instructions allow external bus monitoring.
Syntax Below is usage and syntax information for this command
Command Format dm /(d | e)
Variables /d = disable debug mode (Enable cache or disable
show cycles)
/e = enable debug mode (disable cache or enable
show cycles)
Parameters None.
Example Type dm /e and press enter.
Results: This command disables the 68020 or 68EC030 on-
chip instruction cache or, enables show cycles for
the 68332.
The system returns the prompt upon completion of
this instruction.
Special
Considerations
Enabling the Debug Mode degrades the performance of the
system and may cause certain CPU intensive commands to
activate the watchdog and reset the system.