AT91: DIfference between APB and ASB?

Do you have a question? Post it now! No Registration Necessary

Translate This Thread From English to

Threaded View
Hi,

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?

Someone kindly elaborate
Thanx
Mayank


Re: AT91: DIfference between APB and ASB?
Quoted text here. Click to load it

APB is simpler (no burst transfers etc) and slower than the ASB.

Typically APB is used for stuff like UARTs, whereas as ASB will be used for RAM.

http://www.arm.com/documentation/SoC/index.html

Cheers,
Jon

Re: DIfference between APB and ASB?

Quoted text here. Click to load it
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.




Quoted text here. Click to load it



Site Timeline