4 About the Trace Port Interface Unit
An external Trace Port Analyzer (TPA) captures trace data when the TPIU drives the external pins of a trace port.
The TPIU does the following:
- Coordinates stopping trace capture when a trigger is received.
- Inserts source ID information into the trace stream
so that trace data can be re-associated with its trace source. The
operation of the trace formatter is described in the CoreSight™ Architecture Specification.
- Outputs the trace data over trace port pins.
- Outputs patterns over the trace port so that a TPA can tune its capture logic to
the trace port, maximizing the speed at which trace can be captured.
This section contains the following subsections: