Q-gating cell architecture to satiate the launch-off-shift (LOS) testing and an algorithm to identify best Q-gating candidates

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United States of America Patent

PATENT NO 9086458
APP PUB NO 20150067423A1
SERIAL NO

14011786

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Abstract

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A method for creating an architecture to support Q-gating for launch-off-shift (LOS) scan testing using a plurality of flip-flops is provided. The method may include applying a common clock signal to each clock input of the plurality of flip-flops and applying a gated scan enable signal to each scan enable input of the plurality of flip-flops. The method may further include applying a global scan enable signal directly to each of a plurality of Q-gates corresponding to each of the plurality of flip-flops, wherein the global scan enable signal traverses a signal path that bypasses combinational logic located between any two flip-flops of the plurality of flip-flops.

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Patent Owner(s)

  • INTERNATIONAL BUSINESS MACHINES CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
GopalaKrishnaSetty, Raghu G Bangalore, IN 20 32
Kulshreshtha, Kshitij Karnataka, IN 2 4
Upputuri, Balaji Bangalore, IN 6 5

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