Technical data

RAM - Local RAM Tests

http://www.motorola.com/computer/literature 3-101

MARCH - March Pattern

Command Input

PPCx-Diag>ram march

Description

This is the memory march test, the purpose of which is to verify addressing

of memory in the range specified by the configuration parameters for the

RAM test group. Addressing errors are sought by writing a pattern and its

complement to each location. This test is coded to use only 32-bit data

entities. The test proceeds as follows:

1. Starting at the beginning test address and proceeding towards the

ending address, each location is written with the starting pattern.

2. Starting at the beginning test address and proceeding towards the

ending address, each location is verified to contain the starting

pattern and is written with the complement of the starting pattern.

3. Starting at the ending test address and decreasing to the starting test

address, each location is verified to contain the complement of the

starting pattern and is then written with the starting pattern.

Response/Messages

After the command has been issued, the following line is printed:

RAM MARCH: March Address.............. Running --->

If all parts of the test are completed correctly, then the test passes:

RAM MARCH: March Address............Running ---> PASSED

If the test fails, then the display appears as follows:

RAM MARCH: March Address...........Running ---> FAILED

RAM/MARCH Test Failure Data:

Data Miscompare Error:

Address =________, Expected =________, Actual =________