Electronic digital logic circuitry – Reliability – Redundant
Patent
1996-11-01
1998-10-20
Tokar, Michael J.
Electronic digital logic circuitry
Reliability
Redundant
326 38, 326 39, 326 41, H03K 19003, H03K 19173
Patent
active
058251979
ABSTRACT:
A programmable logic array integrated circuit has several regular columns of programmable logic circuitry and a spare column which includes a subset of the programmable logic circuitry that is included in a regular column. In the event of a defect in the circuitry in a regular column that is duplicated in the spare column, the regular column logic functions that are thus duplicated are shifted from column to column so that the spare column circuitry is put to use and the defective regular column circuitry is not used. Regular column functions that are not duplicated in the spare column are not shifted. Data for programming the columns is selectively routed to the columns with or without column shifting, depending on whether that data is for functions that are or are not duplicated in the spare column.
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Lane Christopher F.
Reddy Srinivas T.
Wang Bonnie I-Keh
Altera Corporation
Jackson Robert R.
Rose James W.
Roseen Richard
Tokar Michael J.
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