Invention Grant
US09026875B2 Multiple-capture DFT system for detecting or locating crossing clock-domain faults during self-test or scan-test
有权
多捕获DFT系统,用于在自检或扫描测试期间检测或定位跨时钟域故障
- Patent Title: Multiple-capture DFT system for detecting or locating crossing clock-domain faults during self-test or scan-test
- Patent Title (中): 多捕获DFT系统,用于在自检或扫描测试期间检测或定位跨时钟域故障
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Application No.: US13894670Application Date: 2013-05-15
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Publication No.: US09026875B2Publication Date: 2015-05-05
- Inventor: Laung-Terng Wang , Po-Ching Hsu , Shih-Chia Kao , Meng-Chyi Lin , Hsin-Po Wang , Hao-Jan Chao , Xiaqing Wen
- Applicant: Syntest Technologies, Inc.
- Applicant Address: US CA Sunnyvale
- Assignee: Syntest Technologies, Inc.
- Current Assignee: Syntest Technologies, Inc.
- Current Assignee Address: US CA Sunnyvale
- Agency: Bacon & Thomas, PLLC
- Main IPC: G01R31/3177
- IPC: G01R31/3177 ; G01R31/317 ; G01R31/3185

Abstract:
A method for providing ordered capture clocks to detect or locate faults within N clock domains and faults crossing any two clock domains in an integrated circuit or circuit assembly in scan-test or self-test mode, where N>1, each clock domain having one capture clock and a plurality of scan cells, each capture clock comprising a plurality of capture clock pulses; said method comprising: (a) generating and shifting-in N test stimuli to all said scan cells within said N clock domains in said integrated circuit or circuit assembly during a shift-in operation; (b) applying an ordered sequence of capture clocks to all said scan cells within said N clock domains, the ordered sequence of capture clocks comprising at least a plurality of capture clock pulses from two or more selected capture clocks placed in a sequential order such that all clock domains are never triggered simultaneously during a capture operation; and (c) analyzing output responses of all said scan cells to locate any faults therein.
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