8/9 and 8/10-bit encoding to reduce peak surge currents when...

Details 8/9 and 8/10-bit encoding to reduce peak surge currents when... 8/9 and 8/10-bit encoding to reduce peak surge currents when...

2007-04-30

2008-10-21

Mai, Son L (Department: 2827)

Static information storage and retrieval

Systems using particular element

Amorphous

C365S148000

Reexamination Certificate

active

07440316

ABSTRACT:
Phase-change memory (PCM) cells store data using alloy resistors in high-resistance amorphous and low-resistance crystalline states. The memory cell's reset current can be double a set current, causing peak currents to depend on write data. When all data bits are reset to the amorphous state, a very high peak current is required. To reduce this worst-case peak current, the data is encoded before storage in the PCM cells. An 8/10 encoder adds 2 bits but ensures that no more than half of the data bits are reset. An 8/9 encoder adds an indicator bit, and inverts the 8 bits to ensure that no more than half of the bits are reset. The indicator bit indicates when the 8 bit are inverted, and when the 8 bits are un-inverted. Peak currents are thus reduced by encoding to reduce reset data bits.

REFERENCES:
patent: 5933365 (1999-08-01), Klersy et al.
patent: 6512241 (2003-01-01), Lai
patent: 6545907 (2003-04-01), Lowrey et al.
patent: 6768665 (2004-07-01), Parkinson et al.
patent: 6869883 (2005-03-01), Chiang et al.
patent: 7026639 (2006-04-01), Cho et al.
patent: 7078273 (2006-07-01), Matsuoka et al.
patent: 7103718 (2006-09-01), Nickel et al.
patent: 2003/0223285 (2003-12-01), Khouri et al.
patent: 2004/0228163 (2004-11-01), Khouri et al.
patent: 2004/0248339 (2004-12-01), Lung
patent: 2004/0256610 (2004-12-01), Lung
patent: 2005/0185572 (2005-08-01), Resta et al.
patent: 2006/0018183 (2006-01-01), De Sandre et al.
patent: 2006/0097239 (2006-05-01), Hsiung
patent: 2006/0126381 (2006-06-01), Khouri et al.
patent: 2006/0203542 (2006-09-01), Kurotsuchi et al.
patent: 2006/0274574 (2006-12-01), Choi et al.

Affiliated with

Also associated with

Rating

8/9 and 8/10-bit encoding to reduce peak surge currents when... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with 8/9 and 8/10-bit encoding to reduce peak surge currents when..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 8/9 and 8/10-bit encoding to reduce peak surge currents when... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3992999