2.4. Performance Monitoring Unit

The CCI-400 includes logic to gather various statistics on the operation of the interconnect during runtime, using events and counters. These events provide useful information about the behavior of the interconnect that you can use when debugging or profiling traffic.

The PMU provides four counters. Each counter can count any of the events available in the CCI-400. To keep the PMU logic overhead to a minimum, the absolute counts and timing of events might vary slightly. This has negligible effect except in cases where the counters are enabled for a very short time.

The PMU consists of:

This section describes:

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