Toshiba Portege M780, Maintenance Manual

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Tests and Diagnostics
PORTEGE M780 Maintenance Manual (960-809) [CONFIDENTIAL] 3-171
Test data = CCAA5533H, 8000000H
Step 2: Byte Enable Test
Write the data byte by byte to the initial address of the data in 64KB units and the initial
data + 4, then read double words of the written data and compare the result with the original
data.
Test data = CCAA5533H, 8000000H
Step 3: Data Bus Test
Write double words of the data to the initial address of the data in 64KB units and the initial
a 4, then read double words of the written data and compare the result with the
original data
Test data = 1H, 2H, 4H, 8H, 10H, …… 8000000H, 0
Step 4: Constant Data Test
Write double words of the data to the whole of the data in 64KB units, then read double
words of the written data and compare the result with the original data.
Test data = FFFFFFFFh, 00000000h, 80018001h
Step 5: Address Pattern Test
Write double words of the data to the address pattern data, read double words of the written
data and compare the result with the original data
Test data = 0000H, 0004H, 0008H, 000CH …..
.. 8000H, 8004H ….FFECH
If a compare error occurs, the write data, read data and test address are displayed on the test
screen.
1-2) The test information (Test address) during a test is displayed by 4 KB. Test step number
is also displayed.
2) Protected Mode
This subtest writes constant data and address data (from 1MB to maximum MB), and reads
the new data and compares the result with the original data.