| 摘要 |
PROBLEM TO BE SOLVED: To easily test a microprocessor containing a cache memory at the low cost by building in the internal circuits excluding an internal circuit that executes a text program stored previously in the cache memory and performs the input/output operations to the outside. SOLUTION: In a normal operation mode, a specific address that does not exist in a cache memory 1 and requires no conversion is outputted from a sequence control unit 6 when a reset state is canceled. When a test mode is set at a mode register 11, an address (test reset address) that accesses a cache instruction is selected. Then an instruction group (test program) which is previously written in the memory 1 in a cache test mode is executed. The test result is rewritten in a data cache by a store instruction, etc. The contents of the memory 1 are read out in a cache test mode and compared with the expected value by a tester for the decision of the acceptance or rejection of the contents. |
