13.2.2. TPIU Formatter

The formatter inserts source ID signals into the data packet stream so that trace data can be re-associated with its trace source. The formatter is always active when the Trace Port Mode is active.

The formatting protocol is described in the Arm® CoreSight™ Architecture Specification (v2.0). You must enable synchronization packets in the DWT to provide synchronization for the formatter.

When the formatter is enabled, half-sync packets can be inserted if there is no data to output after a frame has been started. Synchronization, caused by the distributed synchronization from the DWT, ensures that any partial frame is completed, and at least one full synchronization packet is generated.

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