Static information storage and retrieval – Read/write circuit – Flip-flop used for sensing
Patent
1994-06-02
1995-09-12
Nguyen, Viet Q.
Static information storage and retrieval
Read/write circuit
Flip-flop used for sensing
365 94, 365104, 365184, G11C 700
Patent
active
054503639
ABSTRACT:
A memory system contains a plurality of memory cells, a sensing circuit, and a translator circuit. The memory cells store one of a plurality of threshold levels, wherein the threshold levels demarcate windows for designating more than a single bit of data for each memory cell. The sensing circuit, coupled to the memory cells, generates at least one binary coded bit from the threshold level sensed. A translator circuit translates the binary coded bits to gray coded bits such that only one bit changes state between adjacent threshold levels. Because of this, a decrease from one threshold level to a lower adjacent threshold level in a memory cell results in the change of only a single bit of data, thus improving the memory system reliability. The memory system also includes the ability to store threshold states in either a multi-level cell mode or a standard level cell mode. In the standard cell mode, the translator circuit directly passes the binary coded bits without performing any translation.
REFERENCES:
patent: 4202044 (1980-05-01), Beilstein, Jr. et al.
patent: 4287570 (1981-09-01), Stark
patent: 4388702 (1983-06-01), Sheppard
patent: 4415992 (1983-11-01), Adlhoch
patent: 4586163 (1986-04-01), Koike
patent: 4653023 (1987-03-01), Suzuki et al.
patent: 4701884 (1987-10-01), Aoki et al.
patent: 4771404 (1988-09-01), Mano et al.
patent: 5012448 (1991-04-01), Matsuoka et al.
patent: 5043940 (1991-08-01), Harari
patent: 5163021 (1992-11-01), Mehrotra
patent: 5172338 (1992-12-01), Mehrotra
patent: 5297148 (1994-03-01), Harari
patent: 5351210 (1994-09-01), Saito
Christopherson Mark
Kwong Phillip M.
Wells Steven E.
Intel Corporation
Nguyen Viet Q.
LandOfFree
Gray coding for a multilevel cell memory system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gray coding for a multilevel cell memory system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gray coding for a multilevel cell memory system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-410913