Method and apparatus for replacing defective rows in a...

Details Method and apparatus for replacing defective rows in a... Method and apparatus for replacing defective rows in a...

2005-05-03

2005-05-03

Le, Thong Q. (Department: 2818)

Static information storage and retrieval

Associative memories

Ferroelectric cell

C365S200000, C365S230030

Reexamination Certificate

active

06888731

ABSTRACT:
A method for replacing a defective row in a CAM array, the array having a plurality of normal rows of cells and at least one spare row of cells, each the row being enabled by a corresponding word line signal, and having corresponding match line outputs switched to corresponding ones of a plurality of match line inputs in a match line decoder, the method comprising the steps of: (a) generating a signal indicative of the location of a defective row in the array; (b) generating a set of word line select signals for selecting ones of the plurality of normal rows; (d) using the defective row signal to switch a word line select signal of the defective row to a row adjacent the defective row and switching the adjacent row word line select signals to subsequent rows upto the at least one spare row, and (e) using the defective row signal to switch the match line input of the row adjacent the defective row to the matchline input of the defective row and switching the subsequent row match line input to the adjacent row match line input, repeating the switching for subsequent matchlines upto the matchline of the at least one spare row.

REFERENCES:
patent: 5327383 (1994-07-01), Merchant et al.
patent: 6229742 (2001-05-01), Srinivasan et al.
patent: 6249467 (2001-06-01), Pereira et al.
patent: 6275426 (2001-08-01), Srinivasan et al.
patent: 6445628 (2002-09-01), Pereira et al.
patent: 6525987 (2003-02-01), Hilbert
patent: 20020122337 (2002-09-01), Kanazawa et al.

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