Cache Memory Test - Toshiba Satellite U400 Maintenance Manual

Test Program for Field.

3.11 Cache Memory Test

To execute the Cache Memory Test select 08 from the Diagnostic Test Menu, press Enter
and follow the directions on the screen. The Cache Memory Test contains eight subtests that
test the computer's cache memory. Move the highlight bar to the subtest you want to execute
and press Enter.
NOTE: If NO is selected for Test Loop on the Test Parameter menu, the screen will
remain blank while the subtest is executing. When the test is complete the Cache Memory
Test menu displays.
If YES is selected for Test Loop on the Test Parameter menu, the Test Status screen
displays while the subtest is executing. Press Ctrl + break to return to the Cache Memory
Test menu.
Subtest 01
Subtest 02
Subtest 03
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Constant Data Test
This subtest reads the contents of cache memory and saves it into RAM. The
subtest then writes constant data (FFFFH, AAAAH, 5555H, 0101H, 0000H),
reads the new data and compares the result with the original data pattern. The
original cache memory content is then restored to the cache memory.
Address Pattern Test
This subtest reads the contents of cache memory and saves it into RAM. The
subtest then writes address data patterns (0000H, 0001H, 0002H, through
3FFDH, 3FFEH, 3FFFH), reads the new data and compares the result with the
original data. The original cache memory content is then restored to the cache
memory.
Increment/Decrement Test
This subtest reads the contents of cache memory and saves it into RAM. The
subtest then writes the increment data (00H, 01H, 02H, through FDH, FEH,
FFH), reads the new data and compares the result with the original data. After
comparing the incremental data, decrement data (FFH, FEH, FEH, through
02H, 01H, 00H) is written and the new data is read and compared with the
original data. The original cache memory content is then restored to the cache
memory.
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