AMBA APB

5.7Interfacing APB to ASB

Interfacing the AMBA APB to the ASB is described in:

•Write transfer

•Read transfer on page 5-21.

5.7.1Write transfer

Figure 5-15 illustrates how an interface from ASB to APB can be constructed. The write transfer can occur with zero wait-states, although an additional wait state is required for a burst of writes.

BCLK

AMBA APB

5.7.2Read transfer

The read transfer will always require a single wait state (see Figure 5-16). In systems with a high clock frequency it may be necessary to insert an additional wait state to ensure that the read data has adequate time to pass through the bridge and become valid on the ASB.

BCLK