Motorola M68CPU32BUG Manuel d'utilisateur télécharger pdf (Page 73)

DIAGNOSTIC FIRMWARE GUIDE

M68CPU32BUG/D REV 1 6-4

6.2.13 Zero Pass Count (ZP)

Executing this command resets the pass counter DP to zero. This is frequently desirable before

entering a command that executes the loop-continue mode. Entering this command on the same

line as LC results in the pass counter being reset every pass.

6.3 UTILITIES

The monitor is supplemented by several utilities that are separate and distinct from the monitor

itself and the diagnostics.

6.3.1 Write Loop

WL.<SIZE> [<ADDR> [<DEL><DATA>]]

The WL command executes a streamlined write of specified size to a specified memory location.

This command is intended as a debugging aid once specific fault areas are identified. The write

loop is very short in execution so measuring devices such as oscilloscopes may be utilized in

tracking failures. Pressing the BREAK key does not terminate this command, but pressing the

ABORT switch or RESET switch does.

Command size must be specified as B for byte, W for word, or L for longword.

The command requires two parameters: target address and data to be written. The address and

data are both hexadecimal values and must not be preceded by a $. To write $00 out to address

$10000, enter WL.B 10000 00. The system prompts the user if either or both parameters are

omitted.

EXAMPLES

CPU32Bug>SD<CR> Switch to diagnostic directory

CPU32Diag>WR.W<CR> Prompts for address and data to which to

write word value.

CPU32Diag>WR.B 40FC E6<CR> Writes $E6 to $40FC

CPU32Diag>WR.W 800C 43F6<CR> Writes $43F6 to $800C

CPU32Diag>WR.L 54F0 F8432191<CR> Writes $F8432191 to $54F0

DIAGNOSTIC FIRMWARE GUIDE

M68CPU32BUG/D REV 1 6-1

CHAPTER 6

DIAGNOSTIC FIRMWARE GUIDE

6.1 INTRODUCTION

This diagnostic guide contains operation information for the CPU32Bug Diagnostic Firmware

Package, hereafter referred to as CPU32Diag. Paragraph 6.3 describes utilities available to the

user. Paragraphs 6.4 through 6.6 are guides to using each test.

6.2 DIAGNOSTIC MONITOR

The tests described herein are called via a common diagnostic monitor, hereafter called monitor.

This monitor is command-line driven and provides input/output facilities, command parsing,

error reporting, interrupt handling, and a multi-level directory.

6.2.1 Monitor Start-Up

At the CPU32Bug> prompt, enter SD to switch to the diagnostics directory. The Switch

Directories (SD) command is described elsewhere in this chapter. The prompt should now read

CPU32Diag>.

6.2.2 Command Entry and Directories

Enter commands at the CPU32Diag> prompt. The command name is entered before pressing the

carriage return <CR>. Multiple commands may be entered. If a command expects parameters

and another command is to follow it, separate the two with an exclamation point (!). For

instance, to execute the MT B command after the MT A command, the command line would read

MT A ! MT B. Spaces are not required but are shown here for legibility. Several commands may

be combined on one line.

Commands are listed in the diagnostic directory. Some commands have sub-commands which

are listed in the directory for that particular command (see example below).

CPU A

COMMAND

SUB-COMMAND

eescale S

emiconduct

, I

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

nc...

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