论文部分内容阅读
逻辑分析仪,作为数字领域的示波器,其应用愈来愈受人们所注目。作者用一般常用集成芯片设计了一种逻辑分析仪,该仪器具有逻辑分析仪的一般功能,而且所用硬件省,对辅助性工作外设如显示器、微处理管理器不作专门设置,而借用一般实验室具有的示波器、单板机。工作原理:首先将被跟踪的数据进行采样暂存,经触发限定识别,符合要求就存入存贮器,存满后就转入显示。根据工作方式及监测的总线,逻辑分析仪分为两类:一类是逻辑状态分析仪。用字符“0”、“1”或助记符显示,它能对系统进行实时状态分析,检查在系统时钟作用下,总线上的信息状态,它必须与系统同步工作。另一类是逻辑定时分析仪。用时序图显示,能观察几个相关的控制信号间的时序关系,这对检查逻辑电路系统的工作情况很方便。它是与系统异步工作的,采样频率应高于被测系统频率。定时仪与状态仪工
Logic analyzers, as the field of digital oscilloscopes, are attracting more and more attention. The author designs a kind of logic analyzer with commonly used integrated chip, the instrument has the general function of logic analyzer, and the hardware used is provincial, does not make special settings for auxiliary working peripherals such as display and microprocessing manager, but borrows general experiment Room with oscilloscope, single board machine. How it works: First, the data to be tracked sampling temporary storage, triggered by the limited identification, in line with the requirements of the deposit into the memory, after the turn into the display. According to the working methods and monitoring of the bus, logic analyzers are divided into two categories: one is the logic state analyzer. Character “0”, “1” or mnemonic display, it can conduct real-time status analysis of the system, check the status of the information on the bus under the system clock, it must work with the system. The other is logic timing analyzer. Using a timing diagram, it is possible to observe the timing relationship of several related control signals, which is convenient for checking the operation of a logic circuit system. It is asynchronous with the system, the sampling frequency should be higher than the frequency of the system under test. Timing and state instrumentation