APB clock and AHB clock

[onion2014]

hello all,

can anyone explain the relationship between the clock of AHB and APB. Hope someone can reply....

 

[Jinzpaul4u]

Hello there,

Advanced High-performance Bus (AHB)

AHB is a bus protocol introduced in Advanced Microcontroller Bus Architecture version 2 published by ARM Ltd company.

it has the following features:

1.single edge clock protocol
2.split transactions
3.several bus masters
4.burst transfers
5.pipelined operations
6.single-cycle bus master handover
7.non-tristate implementation
8.large bus-widths (64/128 bit).

example: DMA,USB,ETHERNET,etc

Advanced Peripheral Bus (APB)

APB is designed for low bandwidth control accesses, for example register interfaces on system peripherals. This bus has an address and data phase similar to AHB, but a much reduced, low complexity signal list (for example no bursts). It has to support 32bit and 66 MHz signals.

Example : SPI, I2C,Timer,UART,ADC,etc

 

[mithun mohan]

AMBA(Advance Microcontroller Bus Architecture) is a communication standard for designing high performance embedded microcontrollers.
3 distinct buses are defined within AMBA specification

1. Advanced High Performance Bus(AHB)
2. Advanced System Bus(ASB)
3. Advanced Peripheral Bus(APB)

AHB is for high performance high clock frequency modules.AHB supports the efficient connection of processors,on-chip memories and off-chip external memory interfaces with low-power peripheral macrocell functions.

APB is for low-power peripherals(UART,TIMER etc).APB is optimized for minimal power consumption and reduced interface complexity to support peripheral functions.



A TYPICAL AMBA SYSTEM