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| question about ATA Bus Master（first party DMA） http://forum.hddguru.com/viewtopic.php?f=7&t=23244 |
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| Author: | corner [ June 17th, 2012, 5:09 ] |
| Post subject: | question about ATA Bus Master（first party DMA） |
Q1. how could I know whether an "ATA Bus Master" support "MultiWord DMA" or "Ultra DMA" ? I've not seen related description on official SPEC or Google. Q2. how to use bit5(Device 1 DMA Capable) and bit6(Device 0 DMA Capable) in "ATA Bus Master Status Register" ? Did it respect whether the actual Device(HDD or CD) attached to corresponding ATA HBA port ? Thanks advance. |
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