Patent ID: 6430100
Filing Date: 2002-08-06
Classification: G11C

Abstract:
A redundancy circuitry used in a memory device for repairing defects in a packaged memory having registers by using antifuse, comprising:an anticell means for storing data to be replaced; a temporary anticell means for storing said data temporarily; a row antifuse means having an antifuse and anti enable fuse corresponding to a row address used to program the antifuse for replacing defected cells with redundant cells in the memory device; a column antifuse means having an antifuse and anti enable fuse corresponding to a column address used to program the antifuse for replacing defected cells with redundant cells in the memory device; an antifuse control means for controlling a programming of the antifuse in the row and column antifuse means based on said row or column address; a voltage supplier for supplying a voltage to program said antifuse in said row and column antifuse means by said antifuse control means; a row comparator for comparing a programmed antifuse in the row antifuse means and an external input address, thereby generating a first comparison signal; a column comparator for comparing a programmed antifuse in the column antifuse means and an external input address, thereby generating a first comparison signal; an anti-control means for controlling to provide external data from said anticell means on a read operation and to temporarily store the external data in said temporary anticell means on a write operation based on said first and second comparison signals from said row and column comparators; a restore control means for, based on a row address on a restore operation, transferring the external data identical to a programmed antifuse address to said anticell means, wherein said external data is stored temporarily in said temporary anticell means by a control signal from said anti-control means and said first comparison signal from said row comparator; and a channel selection memory for storing a channel address for pre-fetch and restore operations provided during read and write operations.