RC time sequence analyzer
A timing analysis and sampling clock technology, applied in the field of virtual instruments, can solve the problems of heavy design workload, easily damaged interfaces, and complicated use, and achieve the effect of shortening the period of modification and upgrading, realizing flexibility and convenient use.
Inactive Publication Date: 2005-11-30
TSINGHUA TONGFANG CO LTD
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Problems solved by technology
[0005] 1. Existing products are complicated to use and expensive, so they cannot meet the requirements of many low-end application users
[0006] 2. Existing products use the parallel port of the microcomputer to transmit data with the microcomputer, but the parallel port of the microcomputer is usually connected to a printer or a dongle. When using this product, it is often necessary to constantly plug and unplug the interface, which is complicated to use and easily damaged.
[0007] 3. The control and execution parts of existing products are all designed by programmable logic devices, but programmable logic devices are suitable for logic processing, which leads to heavy design workload and complicated modification for process control work
Method used
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[0014] see figure 1 , figure 2 , a PC timing analyzer, including the serial port voltage converter U3 of the model MAX202, the main control microcontroller U1 of the model AT89C52, the logic controller U4 of the model ISP1016, the high-speed memory U5 of the model CY7C199 and the logic tri-state gate 74HCT244 The composed sampling data interface U6, the sampling clock U7 is a 50MHz quartz crystal frequency generator. One end of the serial port voltage converter U3 is connected to the microcomputer, and the other end is connected to the main control microcontroller U1; one end of the main control single chip U1 is connected to the logic controller U4 through the control bus L2, and the other end is connected to the high-speed memory U5 and the sampling data interface through the data bus L1 U6; one end of the logic controller U4 is connected to the high-speed memory U5 through the address bus L3, and the other end is connected to the sampling clock part U6. The commands inpu...
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The invention belongs to virtual instrument technique area. Serial interface mode is utilized for data transmission between the analyzer and microcomputer. Flow control and logic treatment are separated. The invented method possesses features of simple. The instrument includes serial port voltage changer, main control single chip, logic controller, high-speed memory and sampled data interface. One end of serial port voltage changer is connected to microcomputer, and the other end is connected to main control single chip. One end of main control single chip through control bus is connected to logic controller and the other end through data bus is connected to high-speed memory and sampled data interface. One end of the logic controller through address bus is connected to high-speed memory, and the other end is connected to a part of sampling clock.
Description
[0001] Field [0002] The invention relates to the technical field of virtual instruments, in particular to a PC timing analyzer. Background technique [0003] A timing analyzer is an instrument for observing the timing relationship between several signal lines of a digital circuit. It plays an important role in the design, debugging and maintenance of digital circuits. At present, the existing PC timing analyzers are combined with state analyzers, collectively referred to as logic analysis cards / instruments, which are used to meet the design, debugging and maintenance of high-performance digital circuits. Its I / O interface, controller, sampling Some are implemented entirely through programmable logic devices. [0004] There is following shortcoming in prior art: [0005] 1. Existing products are complicated to use and expensive, and thus cannot meet the requirements of many low-end application users. [0006] 2. Existing products use the parallel port of the microcomputer...
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IPC IPC(8): G06F13/14
Inventor 杨春武冯一兵万韬
Owner TSINGHUA TONGFANG CO LTD