| 摘要 |
A micro processor board of the bus control system comprises an internal bus which comprise a micro processor, address lines, data lines, and control signal lines, a memory connected via the internal bus with the micro processor, registers such as a system control register, and a bus interface circuit. The access to the main memory, the register, or the bus interface which is executed by the micro processor is outputted from an external bus via the bus interface circuit. Thus, the operation status of the micro processor or the internal bus can be traced by tracing the external bus.
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