Spacing periodic commands to a volatile memory for increased performance and decreased collision

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United States of America Patent

PATENT NO 8549217
APP PUB NO 20110119439A1
SERIAL NO

12620065

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Abstract

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A periodic command spacing mechanism is provided for spacing periodic commands (e.g., refresh commands, ZQ calibration, etc.) to a volatile memory (e.g., SDRAM, DRAM, EDRAM, etc.) for increased performance and decreased collision. In one embodiment, periodic command requests are monitored and if a collision is detected between two or more of the requests, the colliding requests are spaced with respect to one another by a timer offset applied on a chip select basis. The periodic command spacing mechanism may be used in conjunction with command arbitration to make sure the periodic commands are executed without significantly impacting performance (e.g., Reads and Writes are allowed to flow). Preferably, the periodic command requests are initialized by generating an initial sequence of individual requests, each successive request in the initial sequence being generated spaced apart with respect to the previous request by a timer offset applied on a chip select basis.

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Patent Owner(s)

Patent OwnerAddress
LENOVO INTERNATIONAL LIMITED979 KING'S ROAD 23/F LINCOLN HOUSE TAIKOO PLACE QUARRY BAY

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Blackmon, Herman Lee Moline, US 10 222
Freking, Ronald Ernest Rochester, US 3 55
Haraden, Ryan Scott Rochester, US 18 95
Kirscht, Joseph Allen Rochester, US 27 261

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