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5.2.3.2 Register - Host to Device
The Register - Host to Device FIS has the following layout:
3
3
2
2
2
2
2
1
0
9
8
7
6
5
Features
0
Device
1
Features (exp)
2
Control
3
Reserved (0)
4
Figure 5.4 Register - Host to Device FIS layout
The host system uses the Register - Host to Device FIS when information in the
Register Block is transferred from the host system to the device. This is the
mechanism for issuing the ATA command from the host system to the device.
C - To update the Command field, "1" would be set in this field; and to update the
Device Control field, "0" would be set in the field.
If both C = 1 and SRST = 1 are set, operation is not guaranteed.
C141-E269
2
2
2
2
2
1
1
1
1
4
3
2
1
0
9
8
7
6
Command
LBA High
LBA High (exp)
Reserved (0)
Reserved (0)
1
1
1
1
1
1
9 8 7 6 5 4 3 2 1 0
5
4
3
2
1
0
C R R Reserved (0)
LBA Mid
LBA Mid (exp)
Sector Count (exp)
Reserved (0)
5.2 Logical Interface
FIS Type (27h)
LBA Low
LBA Low (exp)
Sector Count
Reserved (0)
5-15
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