| 摘要 |
Trace data outputted by an evaluation chip of a tracing circuit of an in-circuit emulator are successively written into a current bank of a trace memory cyclically. When trace data that matches a designated access event is outputted by the evaluation chip, the trace data corresponding to the designated access event is written into the current bank (#1) of the trace memory and thereafter the write pointer is moved to the front end of the next bank (#2). Thereafter, the trace data writing into the current bank (#2) is repeated cyclically. When trace data that matches a designated fetch event is outputted by the evaluation chip, the trace data corresponding to the designated fetch event is written into the current bank (#2) of the trace memory and thereafter the write pointer is moved to the front end of the next bank (#3). Subsequently, the trace data writing into the current bank (#3) is continued to the rear end of the current bank (#3), and thereafter the write pointer is moved to the front end of the next bank (#4), without executing the loop writing to the current bank (#3) (delay function). By the operation of the tracing circuit, "fetch data" and "access result" corresponding to the "fetch data" can certainly be preserved in the trace memory (without being deleted by the overwriting) and displayed as a pair even when pipeline processing is executed by the CPU of the evaluation chip, without the need of a large storage capacity of the trace memory.
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