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随着微处理机应用范围的日益扩大,不论是家用电器还是工业设备的设计均采用了数字显示及自控程序。这些设备在研制开发中所遇到的软件故障、硬件故障急需解决。微处理机中的中央处理单元和存贮器的功能是由组合逻辑完成的,在它的母线中连续传输的信号称为数据。因此操作者所感兴趣的是如何去捕获16位地址线、8位数据线和控制线中的数据,并希望同时能观察这些信号。对于示波器来说,它就不可能有足够的通道来同时进行测量;而逻辑分析仪就能有足够的通道来观察这些信号。示波器与逻辑分析仪的根本不同是示波器是实时测量,操作者所关心的是实际波形;而逻辑分析仪是在时钟脉冲作用下对信号取样,所关心的是信号相对于阈值来说是高电平还是低电平,如 TTL 器件,其阈值为+1.4V。对正逻辑而言,当其值高于阈值为高电平,即逻辑状态为“1”,低于阈值为低电平,即逻辑状态为“0”。逻辑分析仪更关心在某时刻信号之间的相对关系。此外,示波器和逻辑分
With the growing range of applications of microprocessors, whether it is the design of household appliances or industrial equipment are used digital display and self-control program. These devices encountered in the development of software failures, hardware problems urgently need to be resolved. The functions of the central processing unit and memory in the microprocessor are performed by the combinational logic, and the signals continuously transmitted in its bus are called data. So what the operator is interested in is how to capture the data in 16 address lines, 8 data lines and control lines, and hope to observe these signals at the same time. It is impossible for an oscilloscope to have enough channels for simultaneous measurements; logic analyzers have enough channels to view these signals. Oscilloscope and logic analyzer is the fundamental difference between the oscilloscope is real-time measurement, the operator is concerned about the actual waveform; and logic analyzer is the signal under the clock pulse sampling, is concerned about the signal relative to the threshold is high Flat or low level, such as TTL devices, the threshold is + 1.4V. Positive logic, when its value is higher than the threshold is high, that is, the logic state is “1”, below the threshold is low, that is, the logic state “0”. Logic analyzers are more concerned with the relative relationships between signals at some point in time. In addition, the oscilloscope and logic points