15-line to 4-line coding circuit

Abstract

The invention provides a 15-line to 4-line coding circuit, comprising 34 buffers which are used for converting hex count codes into 4-bit count codes and outputting the 4-bit count codes. According to the15-line to 4-line coding circuit, 15-line input signals are converted into 4-line 8421 codes and the 4-line 8421 codes are output; the data competition is eliminated; an error is effectively prevented from occurring in a logic result of the circuit; moreover, the signal lines is reduced; the area cost of layout is reduced; and the cost is greatly reduced.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a 15-wire to 4-wire coding circuit. Background technique [0002] The encoding circuit is a circuit that compiles multi-line (generally 2n-1) parallel input signals into multi-line (generally n) parallel output circuits to achieve the purpose of reducing output signal lines or reducing output pins, and is widely used in various in an integrated circuit. Currently commonly used encoding methods include 8421 code, Gray code, BCD code, etc., where BCD code is a binary code decimal number. In addition, in 2013, Zhao Xia and others from Southeast University invented a new coding method, named "restricted competition counting code" (patent number: CN201310027068.4). The following table shows several encoding methods: [0003] [0004] It can be seen from the above table that the "restricted competition counting code" is a variant of the Gray code, which requires memory to...

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Problems solved by technology

[0008] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a 15-wire to 4-wire encoding circuit, which is used to solve the problems in the prior art that the encoding circuit is prone to competition and occupies a large layout area.

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