ARM Technical Support Knowledge Articles

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

Applies to: CoreSight System Design


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.

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