Motorola MVME712A/D3 User Manual download pdf (Page 106)

Test Descriptions

3-62 167Bug Debugging Package UserÕs Manual

Scrubbing - SCRUB

This function tests refresh "scrubbing" of errors from DRAM. It checks the

ECC memory board's capability to correct single-bit-errors during normal

DRAM refresh cycles. During its operation, the diagnostic displays the

current memory board number that it is working on. When the fast-refresh

mode is selected, "wait" is displayed, indicating that the test is waiting long

enough for fast-refresh to get to every memory location on the board at least

once.

Command Input:

167-Diag>MCECC SCRUB

Response/Messages:

A short message is printed during the test's progress on the "running" line

printed by CTMI, to indicate what "phase" the test is in, and what board it is

currently running on. The test begins with an ECC memory initialization, and

displays the

init message. Next comes a test of the error-logger which

displays the errlog message. Errors are then planted in memory, and the first

scrub pass runs with the message scrub 1 being displayed. The memory is

then tested with the error-logger. Finally, another pass of the scrubber is run,

and displays the scrub 2 message. This scrub pass is then checked for zero

errors. Finally, if all went well, PASSED is displayed.

ECC SCRUB: ECC Scrubbing............... Running ---> bd # init

ECC SCRUB: ECC Scrubbing............... Running ---> bd # errlog

ECC SCRUB: ECC Scrubbing............... Running ---> bd # scrub 1

ECC SCRUB: ECC Scrubbing............... Running ---> bd # scrub 2

ECC SCRUB: ECC Scrubbing............... Running ---> PASSED

If an error is detected during the operation of the test, one of the following

messages is displayed:

Failures due to the scrubber during checkbit initialization:

Timed out waiting for scrubber to start, bd #_ (status __)

Timed out waiting for scrubber to stop, bd #_ (status __)

Failures from the error-logger test:

errlog: logger didn't indicate an error:

bd #_, addr ________, read ________, actual ________

errlog: logger didn't indicate error-on-read, bd #_, addr ________

errlog: logger error address wrong: _______, actual: ______, board #_

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Motorola MVME712A/D3 User Manual Page 106