Toshiba Satellite Pro U300 Maintenance Manual - Page 150

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 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. 46 Satellite U300 and Satellite Pro U300 Tests and Diagnostics Manual