Semiconductor memory device that can relieve defective address

Details Semiconductor memory device that can relieve defective address Semiconductor memory device that can relieve defective address

2008-08-15

2010-11-02

Elms, Richard (Department: 2824)

Static information storage and retrieval

Associative memories

C365S049170, C365S200000, C365S203000

Reexamination Certificate

active

07826241

ABSTRACT:
A pre-decoded address is generated at a high speed in a semiconductor memory device. The device comprises a pre-decoder (210) for generating a first pre-decoded address (PDA1) by pre-decoding the input address (ADD), a CAM circuit (220) for activating the match signal (MT) by responding to the indication of a defective memory cell by the input address (ADD), a ROM circuit (230) for outputting a second pre-decoded address (PDA2) and an enable signal (ES) in response to the activation of the match signal (MT), and a multiplexer (240) for selecting either the first or second pre-decoded address (PDA1or PDA2) on the basis of the enable signal (ES). According to the present invention, there is no need to use a circuit with numerous stages as there is in substituted logic; accordingly, pre-decoded addresses can be generated at a high speed.

REFERENCES:
patent: 5267213 (1993-11-01), Sung et al.
patent: 5930194 (1999-07-01), Yamagata et al.
patent: 6006313 (1999-12-01), Fukumoto
patent: 6614685 (2003-09-01), Wong
patent: 6895537 (2005-05-01), Kawagoe et al.
patent: 7525828 (2009-04-01), Yabe
patent: 2001/0056557 (2001-12-01), Kawagoe et al.
patent: 09-007390 (1997-10-01), None
patent: 2001-358296 (2001-12-01), None

Affiliated with

Also associated with

Rating

Semiconductor memory device that can relieve defective address does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Semiconductor memory device that can relieve defective address, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Semiconductor memory device that can relieve defective address will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4237749