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The Essential Guide to Serial ATA and SATA Express
book

The Essential Guide to Serial ATA and SATA Express

by David A. Deming
October 2014
Intermediate to advanced content levelIntermediate to advanced
496 pages
15h 38m
English
Auerbach Publications
Content preview from The Essential Guide to Serial ATA and SATA Express
SATA Transport Layer 213
DMA Auto-Activate Bit Summary
SATA II provides extension to “DMA setup” FIS.
This eliminates the requirement to use the “DMA activate” FIS.
SATA originally required the use of the DMA Setup FIS, followed by the DMA Activate FIS.
The “Auto-Activate” field is introduced into the DMA Setup FIS.
This field was “reserved” in prior versions of the SATA Specifications.
This results in overhead reduction for DMA transfers due to one less FIS transaction required
during data transfers.
SATA-2 DMA Setup FIS Changes for Auto-Activate
byte n+3 byte n+2 byte n+1 byte n
SOF D23.1 D23.1 D21.5 K28.3
Data dword 0 Reserved Reserved ...
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Publisher Resources

ISBN: 9781482243314