Semiconductor memory with single cell and twin cell refreshing

Details Semiconductor memory with single cell and twin cell refreshing Semiconductor memory with single cell and twin cell refreshing

2006-12-26

2006-12-26

Phung, Anh (Department: 2824)

Static information storage and retrieval

Read/write circuit

Data refresh

C365S131000, C365S230030

Reexamination Certificate

active

07154799

ABSTRACT:
Flags are formed to respectively correspond to memory cell groups each including volatile memory cells. Each flag indicates as a set state that the memory cells store data in a second memory mode. In a changing operation of changing from a first memory mode in which data is independently retained by each memory cell to a second memory mode in which same data are retained in the memory cells of each memory cell group, each flag is reset in response to the first access to the corresponding memory cell group. Therefore, only the first access is made in the second memory mode in each memory cell group. The memory cells are accessed in a mode according to the flag in the changing operation, thereby allowing a system managing the semiconductor memory to freely access the memory cells even during the changing operation. Consequently, a practical changing time can be eliminated.

REFERENCES:
patent: 5875143 (1999-02-01), Ben-Zvi
patent: 6160738 (2000-12-01), Atsumi et al.
patent: 6449204 (2002-09-01), Arimoto et al.
patent: 6515929 (2003-02-01), Ting et al.
patent: 6829192 (2004-12-01), Shinozaki et al.
patent: 2000-298982 (2000-10-01), None
patent: 2001-143463 (2001-05-01), None
patent: 2002-93165 (2002-03-01), None
patent: 2002-170386 (2002-06-01), None
patent: 2002-184181 (2002-06-01), None
patent: 2003-273245 (2003-09-01), None

Affiliated with

Also associated with

Rating

Semiconductor memory with single cell and twin cell refreshing 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 with single cell and twin cell refreshing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Semiconductor memory with single cell and twin cell refreshing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3657889