2.2.1. AMBA APB interface

The AMBA APB interface generates read and write decodes for accesses to the status/control registers and transmit/receive FIFO memories.

The AMBA APB is a local secondary bus which provides a low-power extension to the higher bandwidth AMBA Advanced High-performance Bus (AHB), or AMBA Advanced System Bus (ASB), within the AMBA system hierarchy. The AMBA APB groups narrow-bus peripherals to avoid loading the system bus, and provides an interface using memory-mapped registers which are accessed under programmed control.

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