7.11. Trace port interface

The behavior of the trace port interface is described in:

An ETM might not output trace directly onto a trace port, but instead onto an on-chip bus for routing to an on-chip trace buffer or more complex trace port. One example is the CoreSight AMBA Advanced Trace Bus (ATB), described in the CoreSight Architecture Specification. The ATB enables trace from multiple trace sources, one of which might be an ETM, to be combined and output over one trace port or captured in an on-chip trace buffer. In these systems, triggers must be indicated on the trace port using the mechanism supported by the trace port, and the ETM must be capable of indicating the trigger condition to the trace port interface unit.

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