9.4.3. tracectl removal

The TPIU supports two modes:

The chosen mode depends on the connected trace port analyzer or capture device. Legacy capture devices use the control pin to indicate when there is valid data to capture. Newer capture devices can use more pins for data and do not require a reserved tracectl pin.

If support for legacy TPAs is not required, it is not necessary to implement the tracectl pin. This design choice must be reflected by the value of tpctl.

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