一种基于边界扫描的FIFO测试方法

针对含先进先出存储器(FIFO)电路板故障检测的问题,提出一种基于边界扫描技术编写Macro对FIFO进行读写数据的测试方法,介绍边界扫描技术测试FIFO的基本原理。通过设计适配板,应用边界扫描测试工具ScanWorks,建立边界扫描链路,编写Macro测试代码,利用JTAG接口进行间接控制,实现对FIFO进行故障检测。给出了测试系统硬件框图、简述了适配板设计要点,提供FIFO电路连接图和软件流程图,并分析FIFO测试的完备性,最后还对FIFO进行了测试验证。

A FIFO Test Method Based on Boundary Scan

For the fault detection of printed circuit board with FIFO（First In First Out） chips, a test method based on boundary scan technique, which makes FIFO write and read by writing Macro, is intro- duced. The principle of testing FIFO with boundary scan technique is given. The method can detect the fault of FIFO chip by designing an adapter board, using the testing tool of boundary scan ScanWorks, setting up boundary scan chain, writing Macro test code, and by using JTAG port to control indirectly. Diagram of the hardware is drawled and the main points of designing the adapter board is sketched. The circuit connection diagram of FIFO and software flow diagram are also given. In addition, the completeness of FIFO test is an- alyzed. At the end, the FIFO is tested and verified.