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本文介绍一种直接选址型的DMA快接口.它采用周期窃取技术实现RAM+1,其传数速率较快,三字节时为如9μs,道计数容量约1.7 ×10~7,cpu使用率较高,易于使系统获得较强的在线处理功能,而结构简单,整个线路仅由12个74LS蕊片组成,成本很低,工作可靠.该接口已用于多种核数据获取和处理系统。
This article describes a direct type site DMA fast interface. It uses periodic stealing technology to achieve RAM +1, the rate of its faster, three bytes, such as 9μs, channel counting capacity of about 1.7 × 10 ~ 7, cpu use The higher the rate, easy to make the system to obtain a strong online processing capabilities, and the structure is simple, the entire line consists of only 12 74LS Ruipian composition, low cost, reliable work.This interface has been used for a variety of nuclear data acquisition and processing system .