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Access Ports (AP) slot addresses on the DAP bus

Article ID: 103489541

Published date: 31 Jan 2018

Last updated: -

Applies to: CoreSight Debug and Trace

Question

Is there any requirement that Access Ports (APs) occupy consecutive positions starting from DAP Bus APSEL=0x0 (slot zero)?

Answer

No, the architecture does not mandate starting at slot zero or occupying consecutive slots.

Well-designed debug tools should scan all 256 possible slots on the DAP Bus to determine whether an AP is present in that slot.

Any unoccupied slot should read as zero.

Related information

N/A

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