The arbiter can update the grant signals every bus cycle. However, a new bus master can only become granted and start driving the bus when the current transfer completes, as indicated by BWAIT being LOW. Therefore, it is possible for the potential next bus master to change during waited transfers.
 III. AMBA APB
The AMBA APB acts as local secondary bus which is used for low-power peripherals and is enclosed as a single AHB or ASB slave device. AMBA APB is optimized for minimum power consumption and reduced interface complexity in order to support peripheral functions. The AMBA APB can be used to interface to any peripherals which are having low bandwidth and they do not require the high performance of a pipelined bus interface. [19]