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Coding compression method for grouped testing vectors based on maximum approximate compatibility

A test vector and coding compression technology, which is applied in electronic circuit testing and other directions, can solve problems such as inability to exert compression effects, and achieve the effects of reducing test data volume, large compression effect, and easy compression

Active Publication Date: 2015-12-09
SHANGHAI TAIYU INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the compressed data in this scheme has almost no irrelevant bits at the end, so that the maximum compression effect cannot be exerted, so the scheme needs to be improved and perfected

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  • Coding compression method for grouped testing vectors based on maximum approximate compatibility
  • Coding compression method for grouped testing vectors based on maximum approximate compatibility
  • Coding compression method for grouped testing vectors based on maximum approximate compatibility

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Embodiment Construction

[0022] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0023] The feature of the patent of the present invention is to consider the approximate compatibility between each test vector for the compressed test data, so that the completely incompatible test vectors in the compressed test data set with almost no irrelevant bits can be approximately compatible after being grouped, compatible Test vectors can be further coded for compression.

[0024] Concretely, the coding compression method of the present invention based on the group test vector of maximum approximation comprises the following steps:

[0025] Step 1: There are n test vectors in a source test data set, and ...

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Abstract

The invention discloses a coding compression method for grouped testing vectors based on maximum approximate compatibility. The coding compression method is applied for further compressing test data which are compressed according to a coding-based test data compression method. The coding compression method is characterized in that firstly a memory is required for storing the grouped testing vectors of a source test data set; when an independent bit does not exist in the source test data set, equally dividing the test vectors, calculating the number of noncompatible groups between every adjacent grouped test vectors, and performing coding compression on the adjacent grouped test vectors when a maximum approximate compatibility range is satisfied. Compared with the prior art, the coding compression method is advantageous in that the test data after compression are easier compressed; a maximum compression effect is realized; and the volume of the test data is reduced.

Description

technical field [0001] The invention relates to an integrated circuit testing technology, in particular to a method for encoding and compressing integrated circuit data. Background technique [0002] With the development of design and manufacturing technology, integrated circuit design has developed from the integration of transistors to the integration of logic gates, and now to the integration of IP, that is, SoC design technology. SoC design technology can effectively reduce the development cost of electronic / information system products, shorten the development cycle, and improve the competitiveness of products. It has become the most important product development method adopted by the industry. [0003] Very large scale integrated circuit (VLSI) is extremely complex from design to production process, and the chip is likely to have various defects, which will lead to a great drop in the yield of the chip. Various reasons may include: design errors, test method itself Mis...

Claims

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Application Information

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IPC IPC(8): G01R31/28
Inventor 詹文法赵士钰何姗姗
Owner SHANGHAI TAIYU INFORMATION TECH
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