Reply by Ulf Samuelsson●January 21, 20052005-01-21
"Mayank Kaushik" <firstname.lastname@example.org> skrev i meddelandet
> Im working with the AT91RM9200. I am confused about the distinction
> between the Advanced Peripheral Bus and the Advanced System Bus..what
> are they used for?
The ARM AMBA divides the busses into the ASB (Advanced System Bus)
which is a 32 bit synchronous pipelined bus, and the APB which is a 16 bit
non pipelined bus asynchronous bus.
The CPU and memories are on the ASB and most peripherals are on the APB.
There is a bridge betweeen the ASB and the APB.
The reason for the APB is that the buffering reduces the complexity of
peripheral and mimizes the capacitance on the ASB.
The ASB is replaced by the AHB in the AMBA - II architecture.