The AHB-AP is a Memory Access Port (MEM-AP) as defined in the ARM Debug Interface v5 Architecture Specification. The AHB-AP is an optional debug access port into the Cortex-M3 system, and provides access to all memory and registers in the system, including processor registers through the SCS. System access is independent of the processor status. Either SW-DP or SWJ-DP is used to access the AHB-AP.

The AHB-AP is a master into the Bus Matrix. Transactions are made using the AHB-AP programmers model, which generates AHB-Lite transactions into the Bus Matrix.