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2.4.4. Word output

The STM always tries to perform 32-bit ATB writes to maximize trace bandwidth efficiency. The STM can therefore hold trace packet nibbles until enough nibbles have been generated to enable a 32-bit write. The exception to this is when:

  • an ATB flush is requested

  • the STM is disabled

  • auto-flush is enabled

  • authentication permissions are removed.

In these cases, the STM can perform a smaller-size ATB write after byte aligning the data.

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