一、概述长期以来“信号跟踪方法”是检查模拟电路故障最常用的一种方法,电子系统的原理图上均标出各测试点预期出现的波形。用户只需使用示波器,就能找到不正常的信号,从而修复故障。由于LSI、VLSI这类器件普遍采用软件编程控制,测试技术就变得十分复杂了。微处理器系统是面向总线设计的系统,器件引脚上的各种逻辑状态不能直按指示电路硬件功能是否正常。这些不同的逻辑状态代表数据、地址、控制信号等的二进制数据流。它们揭示了系统的某些功能,但未必与某个特定硬件有关。在这种面向总线的微处理器系统中,数据流变得十分 I. Overview For a long time “signal tracking method” is to check the analog circuit failure of the most commonly used method, the electronic system schematic are marked on the test point of the expected waveform. Users simply use the oscilloscope, you can find abnormal signals, and thus repair the fault. Due to the widespread adoption of software programming controls such as LSIs and VLSIs, test techniques become complicated. Microprocessor system is designed for the bus system, the device pins on the various logic states can not be directed to indicate the circuit hardware functions are normal. These different logic states represent a binary data stream of data, addresses, control signals, and the like. They reveal some of the system’s capabilities, but are not necessarily related to a particular piece of hardware. In this bus-oriented microprocessor system, the data flow becomes very large