These ports supplement the operation of the TPIU and are for the connection of other CoreSight components or other ASIC blocks. Table 8.2 shows the ports not described elsewhere.
TRIGIN Input From either a CTI or direct from a trace source. Used to enable the trigger to affect the output trace stream.
TRIGINACK Output Return response to the CTI acknowledgement to TRIGIN.
FLUSHIN Input External control used to invoke an ATB signal and drain any old historical information on the bus.
FLUSHINACK Output Flush response, goes HIGH to acknowledge FLUSHIN. If the completion of a flush is required then this can be established by the Formatter Flush and Control Register. See Formatter and Flush Control Register, 0x304.
EXTCTLOUT[7:0] Output Used as control signals for any configurable drivers on the output of the trace port such as serializers and output multiplexor.
EXTCTLIN[7:0] Input Used as an input port for any configurable drivers on the output of the trace port such as serializers and output multiplexor.