User guide

Trace Port Interface Unit

ID072410 Non-Confidential

When one of the two SWO modes is selected, bit [1] of TPIU_FFCR enables the formatter to

be bypassed. If the formatter is bypassed, only the ITM and DWT trace source passes through.

The TPIU accepts and discards data from the ETM. This function is can be used to connect a

device containing an ETM to a trace capture device that is only able to capture SWO data.

Enabling or disabling the formatter causes momentary data corruption.

Note

If TPIU_SPPR is set to select Parallel Port Mode, the formatter is automatically enabled. If you

then select one of the SWO modes, TPIU_FFCR reverts to its previously programmed value.

11.3.4 TRIGGER

The TRIGGER characteristics are:

Purpose Integration test of the TRIGGER input.

Usage constraints There are no usage constraints.

Configurations This register is available in all processor configurations.

Attributes See Table 11-1 on page 11-5.

Figure 11-5 shows the TRIGGER bit assignments.

Figure 11-5 TRIGGER bit assignments

Table 11-5 shows the TRIGGER bit assignments.

11.3.5 Integration ETM Data

The Integration ETM Data characteristics are:

Purpose Trace data integration testing.

Usage constraints You must set bit [1] of TPIU_ITCTRL to use this register. See Integration

Mode Control, TPIU_ITCTRL on page 11-11.

Configurations This register is available in all processor configurations.

Attributes See Table 11-1 on page 11-5.

Figure 11-6 on page 11-9 shows the Integration ETM Data bit assignments.

Reserved

31 10

TRIGGER input value

Table 11-5 TRIGGER bit assignments

Bits Name Function

[31:1] - Reserved

[0] TRIGGER input value When read, this bit returns the TRIGGER input.