Logic-compatibility-based digital circuit fault diagnosis method and system
A digital circuit, compatibility technology, applied in the field of digital circuit fault diagnosis and system based on logic compatibility
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no. 1 approach
[0057] Below to image 3 Take the full adder shown as an example to explain the above basic steps.
[0058] 1) After the program starts, the user uses the dialog box to specify the location to open a project.
[0059] 2) The user builds a full adder digital circuit as shown in the above figure through the digital circuit graphical modeling unit 101 . Here, the user selects gate-level standard components AND gates And1 and And2, OR gate Or1, XOR gates Xor1 and Xor2. The user drags and drops them to the position in mind, and then connects the input and output ports of the component - taking Xor1 as an example, its two input ports are connected to a and b respectively, and its output port is connected to Xor2 and And2. In this way, a complete full adder circuit is built.
[0060] 3) The user uses the description configuration unit 102 to set the values of the circuit input terminals a, b, c and the actual observed values of the output terminals q, z, then set the upper lim...
no. 2 approach
[0075] Such as Figure 4 The circuit shown is used to illustrate the implementation and application of this test method. In this circuit, the components include an adder DCAdd, a multiplier DCMul, an AND gate DCAnd, an OR gate DCOr, and a NOT gate DCOr. We have compiled a serial number for all components in the circuit, such as the component numbered 1 is an adder DCAdd. For the convenience of the following description, we will use the serial number of the component to refer to the component.
[0076] The system can randomly select a component and make it work in a faulty manner, such as an incorrect output value at an output. In the experiment, we choose component 13 (a multiplier DCMul) and make it work in a certain faulty way, for example, let its output value be out(13)=8*in2(13), that is, output the input of its input port 2 8 times the value. Using the method provided by the present invention, the diagnostic steps are as follows:
[0077] 1) After the program is sta...
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