Meter-checking computing circuit

Abstract

The present invention provides a method for realizing the combinational logic circuit through table search operation in the field of designing digital circuit, and the each output bit of table value is represented as a logic function of the input bit of the table index and corresponding logic circuit is also designed. The method includes: a table composed of a series of table values and a series of corresponding table index; each output bit of the table value is represented by the input bit of the table index; the logic function is simplified and then the design of the combinational logic circuit of the logic function is realized. In the table search operation of the multiplexer, the real value table of all the input bits must be decoded entirely, thus, the process is unefficient and is a waste of hardware resources; while in the table search operation of ROM, the process has a high cost and a low speed. The method takes full use of the table characteristic to simplify and optimize the table search operation, and is realized through simple combinational logic, and the operation speed is quick and the hardware resource is saved.

Description

technical field [0001] The invention belongs to the field of digital circuit design, and specifically relates to a combined logic circuit realization of table look-up operation. Background technique [0002] With the popularization and promotion of various digital audio and video services such as communications, digital TV, IPTV, mobile TV, video surveillance, and network video, the design and production of high-performance multimedia encoders that meet the latest standards (such as H.264, MPEG-4) Decoding chips have become the focus of the audio and video industry and related chip industries. Since the video standard H.264 adopts a series of technologies and methods to improve the coding efficiency and image quality, its calculation volume and complexity are also greatly increased. Therefore, when designing the chip, the various calculations involved should be simplified and optimized Optimization, thereby improving the computing performance of the ...

AI Technical Summary

Problems solved by technology

But at the same time, this implementation is inefficient and wastes hardware resources since the multiplexer must fully decode the truth table for all table entry index input bits

[0013] In addition, the principle of ROM-based look-up table operation is simple, but it needs the cooperation of data bus, address bus, decoder, etc., and it is expensive, consumes a lot of energy, and the speed is slow

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