Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Meter-checking computing circuit

A computing circuit and look-up table technology, applied to logic circuits with logic functions, etc., can solve the problems of wasting hardware resources, slow speed, high energy consumption, etc., and achieve the effect of saving hardware resources and reducing costs

Inactive Publication Date: 2007-10-17
SICHUAN PANOVASIC TECH
View PDF1 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Meter-checking computing circuit
  • Meter-checking computing circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] The table look-up operation circuit of the present invention will be further described in detail below in combination with specific embodiments.

[0044] In this embodiment, taking the table look-up operation of Table 1 (Table 8-16 in the H.264 standard, threshold β) as an example, a specific table look-up operation circuit is designed according to the present invention.

[0045] Step 1: Convert the original table (Table 1) into a truth table

[0046] The table entry index index number of this table is Num=52, so it is necessary to use m=6-bit binary string to represent the input bit, expressed from high to low as: i 5 i 4 i 3 i 2 i 1 i 0 .

[0047] The maximum value of the entry value is 18, so the output bit is represented by n=5 binary strings, and it is expressed as o from high to low 4 o 3 o 2 o 1 o 0 .

[0048] input bit

i 5 i 4 i 3 i 2 i 1 i 0

output bit

o 4 o 3 o 2 o 1 o 0

input bit

i 5 i 4 i ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H03K19/20
Inventor 杨刚张小云
Owner SICHUAN PANOVASIC TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com