Static information storage and retrieval – Systems using particular element – Capacitors
Reexamination Certificate
2005-05-17
2005-05-17
Tran, M. (Department: 2818)
Static information storage and retrieval
Systems using particular element
Capacitors
C365S222000
Reexamination Certificate
active
06894917
ABSTRACT:
The present invention provides a method and an apparatus for DRAM refresh with different frequencies of refresh for active and standby mode. In addition, this invention utilizes different refresh frequencies during active and standby modes to optimize power dissipation and DRAM data integrity. The refresh frequency during active mode is higher than said refresh frequency during standby mode. The refresh frequency during active mode is higher than the prior art refresh frequency during active mode. The refresh frequency during standby mode is lower than the prior art refresh frequency during standby mode. The higher active mode refresh frequency allows the faster restoration of cell data, which is degraded by capacitive discharge coupling through the selection of adjacent word lines. The low standby mode refresh frequency provides a lower standby power dissipation which compensates for the higher active mode power dissipation caused by the higher active mode refresh frequency.
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Liu Shi Huei
Shiah Chun
Ting Tah-Kang Joseph
Ackerman Stephen B.
Etron Technology Inc.
Saile George O.
Tran M.
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