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ATA QWORD formatting for data buffer
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PostPosted: Tue Nov 11, 2008 6:14 pm    Post subject: ATA QWORD formatting for data buffer Reply with quote

I'm a little fuzzy on the format of an ATA "QWORD" for the SCT
commands.

http://www.t13.org/Documents/UploadedDocuments/docs2006/D1699r3e-ATA8...


Assume a QWORD LBA of 0102030405060708, how is that arrayed in memory
when the bufer is formatted and sent?


Bytes 0-3 = action, etc
Byte04 = 08
Byte05 = 07
Byte06 = 06
Byte07 = 05
Byte08 = 04
Byte09 = 03
Byte10 = 02
Byte11 = 01


or


Bytes 0-3 = action, etc
Byte04 = 01
Byte05 = 02
Byte06 = 03
Byte07 = 04
Byte08 = 05
Byte09 = 06
Byte10 = 07
Byte11 = 08


or the wierd ATA endien byte/word shuffle instead? How would that be
laid out?
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