User manual

DIAGNOSTIC FIRMWARE GUIDE
M68CPU32BUG/D REV 1 6-20
MT H Random Byte Test MT H
6.5.8 Random Byte Test
CPU32Diag>MT H
MT H performs a random byte test from Start Address to Stop Address. The random byte test
has been implemented in this manner:
1. A register is loaded with the value $ECA86420.
2. For each memory location:
• Copy the contents of the register to the memory location, one byte at a time.
• Add $02468ACE to the contents of the register.
• Proceed to next memory location.
3. Reload $ECA86420 into the register.
4. For each memory location:
• Compare the contents of the memory to the register to verify that the
contents are good, one byte at a time.
• Add $02468ACE to the contents of the register.
• Proceed to next memory location.
EXAMPLE
After the command is entered, the display should appear as follows:
H MT Random Byte Test................Running ---------->
If an error occurs, then the memory location and other related information are displayed.
H MT Random Byte Test................Running ---------->..... FAILED
(error-related information)
If no errors occur, then the display appears as follows:
H MT Random Byte Test................Running ----------> PASSED
DIAGNOSTIC FIRMWARE GUIDE
M68CPU32BUG/D REV 1 6-17
MT E March Address Test MT E
6.5.5 March Address Test
CPU32Diag>MT E
MT E performs a march address test from Start Address to Stop Address. The march address test
has been implemented in this manner:
1. All memory locations from Start Address up to Stop Address are cleared to 0.
2. Beginning at Stop Address and proceeding downward to Start Address, each memory
location is checked for bits that did not clear and then the contents are changed to all
F’s (all the bits are set). This process reveals address lines that are stuck high.
3. Beginning at Start Address and proceeding upward to Stop Address, each memory
location is checked for bits that did not set and then the memory location is again
cleared to 0. This process reveals address lines that are stuck low.
EXAMPLE
After the command is entered, the display should appear as follows:
E MT March Addr. Test................Running ---------->
If an error is encountered, then the memory location and other related information are
displayed.
E MT March Addr. Test................Running ---------->..... FAILED
(error-related information)
If no errors are encountered, then the display appears as follows:
E MT March Addr. Test................Running ----------> PASSED
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eescale S
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or
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