基于AHB总线的双通道DMA控制器的系统设计

System design of dual-channel DMA controller based on AHB bus

直接存储存取是一种在各个模块间进行大量数据传输的高速度、高效率的传输方式。在CPU对DMA进行初始化配置后,允许DMA作为主机占用总线,直接对外围设备和存储器的数据进行读写,实现外设和存储器、存储器和存储器之间的数据传输,不再需要CPU的干预,可以解放CPU,极大提高数据传输效率。本文旨在基于AHB总线协议的双通道DMA控制器实现外设与存储器之间的数据传输。

Direct Memory Access(DMA)is a high-speed and high-efficiency transmission method for a large amount of data transmission between various modules.After the CPU initializes and configures the DMA,the DMA is allowed to occupy the bus as the host,and can directly read and write the data of the peripheral devices and the memory,so as to realize the data transfer between the peripheral devices and the memory,and between the memory and the memory,without the intervention of the CPU.The design liberates the CPU and greatly improves the efficiency of data transmission.This paper aims to realize data transfer between peripherals and memory of the dual-channel DMA controller based on the AHB bus protocol.