This section describes the AHB Access Port (AHB-AP), for access to a system AHB bus through an AHB-Lite master. It acts as a slave to the DAP internal bus, driven by only a single debug port, typically an external SWJ-DP, at any one time. Figure 9.2 shows the internal structure of the AHB-AP.
The AHB-AP has two interfaces:
An internal DAP bus interface that connects to the SWJ-DP
An AHB master port for connection through the matrix to the external AHB-Lite interface and the PPB.