Chip protection register unlocking

Details Chip protection register unlocking Chip protection register unlocking

2005-09-20

2005-09-20

Nguyen, Tan T. (Department: 2827)

Static information storage and retrieval

Floating gate

Data security

C365S185110, C711S163000

Reexamination Certificate

active

06947323

ABSTRACT:
An improved Flash memory device is described with a protection register lock bit erase enable circuit. A bond pad coupled to the lock bit erase enable circuit of the improved Flash memory is not bonded when the individual Flash memory chip wafer is packaged. This allows the memory manufacturer to access the bond pad and erase the lock bits while the chip is still in wafer form via a test card probe, but makes the lock bits effectively uneraseable when the chip wafer is packaged. This enables the memory chip manufacturer to enhance reliability and fault tolerance of the Flash memory device by thoroughly testing the lock bits and protection register functionality. Additionally, the lock bit erase enable circuit increases manufacturing flexibility by allowing the memory chip manufacturer to reprogram the protection register and lock bits in case of organizational changes or inadvertent or erroneous programming of the protection register.

REFERENCES:
patent: 5592641 (1997-01-01), Fandrich et al.
patent: 5991197 (1999-11-01), Ogura et al.
patent: 6026016 (2000-02-01), Gafken
patent: 6031757 (2000-02-01), Chuang et al.
patent: 6469928 (2002-10-01), Takata
patent: 6654272 (2003-11-01), Santin et al.
patent: 6654847 (2003-11-01), Roohparvar et al.
patent: 6711701 (2004-03-01), Roohparvar et al.
patent: 2003/0223281 (2003-12-01), Roohparvar
patent: 2004/0083346 (2004-04-01), Chevallier et al.

Affiliated with

Also associated with

Rating

Chip protection register unlocking does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Chip protection register unlocking, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chip protection register unlocking will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3438481