边界扫描结构双向端口设计新方法

Novel Method for Designing Bidirectional Port in Boundary-Scan Architecture

针对边界扫描结构设计中的双向端口,提出一种新颖的解决方法。该方法通过设计一个专用的双向边界扫描单元,实现对双向端口的可观及可控,克服了传统设计方法的许多缺陷。通过对四总线收发器(三态)74HC243IP核的双向管脚加载该双向边界扫描单元后进行仿真实验,结果表明,该方法简单可行,具有较大的实用价值。

A novel solution was proposed for designing bidirectional port in boundary-scan architecture.In this method,a special bidirectional boundary scan cell was designed to control the port,and limitations using the conventional design method were eliminated.Simulation was made by loading the bidirectional boundary scan cell into the bidirectional port of 74HC243 IP core.Results showed that the method was both simple and effective.