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Nondestructive Read-Out of Intermediate Signatures of a Multiple Input Signature Register

IP.com Disclosure Number: IPCOM000044055D
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Cirielli, CA: AUTHOR

Abstract

In a self-test environment it is desirable to inspect (read-out) the multiple input signature register (MISR) contents at several intermediate steps without destroying the sequential random development of the final signature. Utilizing a stable shift register latch (SSRL) in the MISR will provide a temporary preservation of its current value and its simple restoration which is required for continuation to the next intermediate signature and eventually the final signature. A single "save" clock pulse into the L3 latches will temporarily preserve the current value of the L1 latches. A fixed number of shift "A" and "B" clocks are generated to read-out the MISR contents via the scan-out pin.

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Nondestructive Read-Out of Intermediate Signatures of a Multiple Input Signature Register

In a self-test environment it is desirable to inspect (read-out) the multiple input signature register (MISR) contents at several intermediate steps without destroying the sequential random development of the final signature. Utilizing a stable shift register latch (SSRL) in the MISR will provide a temporary preservation of its current value and its simple restoration which is required for continuation to the next intermediate signature and eventually the final signature. A single "save" clock pulse into the L3 latches will temporarily preserve the current value of the L1 latches. A fixed number of shift "A" and "B" clocks are generated to read-out the MISR contents via the scan-out pin. Finally, a single "restore" clock into the L1 latch will retrieve the MISR contents and permit the continuation (from where it left off) of the sequential random generation of the final MISR signature.

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