Reduced refresh power

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United States of America Patent

PATENT NO 9490002
APP PUB NO 20160027498A1
SERIAL NO

14801558

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Importance

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Abstract

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N out of every M number of refresh commands are ignored (filtered out) by a buffer chip on a memory module. N and M are programmable. The buffer receives refresh commands (e.g., auto-refresh commands) from the command-address channel, but does not issue a proportion of these commands to the DRAMs on the module. This reduces the power consumed by refresh operations. The buffer may replace some auto-refresh (REF) commands with activate (ACT) and precharge (PRE) commands directed to specific rows. These rows may have known ‘weak’ cells that require refreshing more often than a majority of the other rows on the module (or component). By ignoring some auto-refresh commands, and directing some others to specific rows that have ‘weak’ cells, the power consumed by refresh operations can be reduced.

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Patent Owner(s)

  • RAMBUS INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Best, Scott C Palo Alto, US 186 3251
Bronner, Gary B Los Altos, US 78 2783
Haukness, Brent S Monte Sereno, US 39 554
Ware, Frederick A Los Altos Hills, US 760 10960

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