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The parity-check circuit has certain typicality and practicability in the analysis and design of the combinational logic circuit. Familiar with the logic function and circuit realization of the odd-odd circuit, it helps to deepen the understanding and mastering of the combinational logic circuit. Taking the example of odd circuit implementation as an example, various implementations of gate circuits, decoders, and data selectors are discussed, and the flexibility and diversity of combinational logic circuit design are illustrated with examples.
1 The truth table and expression of the three-input-variable-arbitrary circuit are used to determine the singularity of a three-input variable. Its input variables are denoted by A, B, and C respectively, and the output function is denoted by F. When there is an odd number of 1 in the value combination of the input variable, the output function value is 1; when the number of 1 in the input variable value combination is an even number, the output function value is 0, according to which the logic relationship can be written The truth table of the three-input variable arithmetic circuit is shown in Table 1.
As can be seen from the truth table 1, there are 4 groups of input variables that make the output function value 1 . Using an inverter, an AND gate, or a gate to realize a three-input odd circuit, its characteristic is that the expression basically does not change, and the realization way is simple and straightforward. The disadvantage is that there are many lines and the circuit is complicated.
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