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CMD640 : ウィキペディア英語版
CMD640

CMD640, the CMD Technology Inc product 0640, is an IDE interface chip for the PCI and VLB buses. CMD640 had some sort of hardware acceleration: WDMA and Read-Ahead (prefetch) support.
CMD Technology Inc was acquired by Silicon Image Inc. in 2001.
== Hardware bug ==

The original CMD640 has a data corruption bug.〔(uni-jena.de - linux/drivers/ide/pci/cmd640.c Version 1.02 Sep 01, 1996 )〕 The data corruption bug is similar to the bug affecting the contemporaneous PC Tech RZ1000 chipset. Both chipsets were used on a number of motherboards, including those from Intel.
Мodern operating systems have a workaround for this bug by prohibiting aggressive acceleration mode and losing about 10% of the performance.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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