X-canceling multiple-input signature register (MISR) for...

Details X-canceling multiple-input signature register (MISR) for... X-canceling multiple-input signature register (MISR) for...

2011-04-12

2011-04-12

Kerveros, James C (Department: 2117)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital logic testing

C714S726000

Reexamination Certificate

active

07925947

ABSTRACT:
A method and apparatus for compacting test responses containing unknown (X) values in a scan-based integrated circuit using an X-canceling multiple-input signature register (MISR) to produce a known (non-X) signature. The known (non-X) signature is obtained by selectively exclusive-ORing (XORing) together combinations of MISR bits which are linearly dependent in terms of the unknown (X) values using a selective XOR network.

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