| 摘要 |
PURPOSE:To improve the efficiency of debug by attaining a constitution where the internal information of a processor can be viewed in real time. CONSTITUTION:A real time trace memory 4 writes the information on address buses 6 and 7 as well as a data bus 7 and the value of an internal register of an emulator processor 1 respectively. At the same time, the information given from an instruction decoding circuit 9 is traced at the memory 4. The processor 1 usually selects the instruction codes stored in an emulation memory 2 via the buses 6 and 7 and fetches them via the bus 7 for execution. The instruction code on the bus 7 is supplied to a register trace discriminating circuit (instruction decoding circuit) 9 for discrimination of a specific register of the processor 1 which is referred to by said instruction code. Then the emulator processor 1 executes the relevant instruction and outputs the value of the register in an idle timing mode of the processor 1.
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