68K System Monitor

GE Energy Services

User's Guide

 

 

DM - Debug Mode

Platform

Description

Syntax

þ CPM þ D20

þ D20 ME

o D20/200

o D20/200 ME

o D25

D20 Base

D20 Base

CCU Base

CCU Base

 

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.

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

Enabling the Debug Mode degrades the performance of the

 

 

Considerations

system and may cause certain CPU intensive commands to

 

 

 

activate the watchdog and reset the system.

 

 

 

 

 

 

 

 

 

 

 

SWM0023 1.00 2

General

3-28

Full Release

 

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Image 54
GE 68K System manual DM Debug Mode