Advanced peripheral bus bridge and control method thereof

Abstract

The invention provides an APB bridge, a control method thereof and a clock control method for an APB bus. The APB bridge comprises an AHB bus interface, an arbitration control unit and an APB bus interface, wherein the AHB bus interface is connected to an AHB bus of an advanced high-performance bus so as to communicate with AHB main equipment; the arbitration control unit is connected with the AHB bus interface and used for receiving request sent by the AHB main equipment through the AHB bus interface, judging whether the request can be executed, and sending first response to the AHB main equipment when the request can be executed so as to release the use rights of the AHB bus used by the AHB main equipment; and the APB bus interface is connected with the arbitration control unit and connected to the APB bus so as to communicate with APB slave equipment on the APB bus. The APB bridge and the control method thereof shorten the time of executing single request, and improve the performance of a system; and the clock control method controls the clock frequency of the APB bus according to the number of the requests to be executed of the APB bus, and can reduce the power consumption of the system.

Description

Technical field [0001] The present invention relates to an Advanced Peripheral Bus (Advanced Peripheral Bus, APB) bridge and a control method thereof, in particular to a method that can shorten the execution time of the request of an Advanced High Performance Bus (AHB) master device and reduce the APB APB bridge of bus clock frequency and its control method. Background technique [0002] In the system on chip (SOC) design, the on-chip bus design is one of the key issues. At present, a variety of on-chip bus standards have been proposed, such as the AMBA (Advanced Microcontroller Bus Architecture) on-chip bus standard introduced by ARM. The AMBA on-chip bus system includes Advanced High Performance Bus (AHB) and Advanced Peripheral Bus (Advanced Peripheral Bus, APB). The AHB bus is used for the interconnection of high-speed devices such as CPUs, and the APB bus is used for memory, etc. For the interconnection of low-speed devices, the APB bridge is connected between the AHB bus an...

AI Technical Summary

Problems solved by technology

And the APB slave device 23 that actually hangs on the APB bus usually works at low frequency equipment, so for the whole bus system, it is a kind of waste of resources that the APB bus works at high frequency all the time, not only makes the power consumption of the system higher than expected power consumption, also reduces the performance of the system

Images