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9.3. Functional interfaces

The functional interfaces of the TPIU are:

  • ATB slave interface, for receiving trace data.

  • APB slave interface, for accessing the TPIU registers.

  • Trace out port, for connecting to the external trace port pins.

  • trigin and flushin event interfaces. These implement synchronizers so that they can be connected to a CTI in a different clock domain.

The TPIU also supports the extctlin[7:0] and extctlout[7:0] signals. These are designed to enable debug tools to multiplex the pins used by the trace out port with other functions.