The AHB-APB bridge is an AHB slave, providing an interface between the high-speed AHB domain and the low-power APB domain. It is used to provide access to the programmable control registers of peripherals (see Product Mapping).
AHB-APB bridge is based on AMBA APB Protocol Specification V2.0 (ref. as APB4)
including:
- Wait state support
- Error reporting
- Transaction protection
- Sparse data transfer (byte, half-word and word)
Additional enhancements:
- Address and data cycles merged into a single cycle
- Sparse data transfer also apply to read access
Figure 1. APB Write Access.
Figure 2. APB Read Access.
