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Testing ternary content addressable memories with active neighbourhood pattern-sensitive faults

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2 Author(s)
Huang, Y.-J. ; Dept. of Electr. Eng., Nat. Central Univ., Jhongli ; Li, J.-F.

With shrinking transistor sizes and growing transistor density, testing neighbourhood pattern-sensitive faults (NPSFs) is increasingly important for semiconductor memories. A test methodology for detecting active NPSFs (ANPSFs) and static NPSFs (SNPSFs) in ternary content addressable memories (TCAMs) is presented. March-like and two-group test methods are two commonly used testing techniques for NPSFs in random access memories. Because of the special TCAM cell structure, however, using a unique test algorithm with only either a March-like or a two-group test operations are not time-efficient. A test methodology that employs both March-based and two-group testing to cover 100% ANPSFs and SNPSFs in TCAMs is proposed. The total test complexity of the proposed test methodology is 156 N for an NtimesK-bit TCAM. No TCAM circuit modification is needed to support the proposed test methodology

Published in:

Computers & Digital Techniques, IET  (Volume:1 ,  Issue: 3 )

Date of Publication:

May 2007

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