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Interface
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.
5.2.3.3 Register - Device to Host
The Register - Device to Host FIS has the following layout:
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
9876 5 4 3 2 10
Error Status R I R Reserved (0) FIS Type (34h)
0
Device LBA High LBA Mid LBA Low
1
Reserved (0) LBA High (exp) LBA Mid (exp) LBA Low (exp) (0)
2
Reserved (0) Reserved (0) Sector Count (exp) Sector Count
3
Reserved (0) Reserved (0) Reserved (0) Reserved (0)
4
Figure 5.5 Register - Device to Host FIS layout
The Register - Device to Host FIS is used when information concerning the Shadow
Register Block in the host adapter is updated. This FIS indicates that the device has
completed a command operation. Furthermore, this is a mechanism for changing
information concerning the Shadow Register Block of the host adapter.
I - If this bit is set, an interrupt request is issued to the host system.
5.2.3.4 DMA Active - Device to Host
The DMA Active - Device to Host FIS has the following layout:
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
9876 5 4 3 2 10
Reserved (0) Reserved (0) R R R Reserved (0) FIS Type (39h)
0
Figure 5.6 DMA Active - Device to Host FIS layout
The host uses the DMA Active - Device to Host FIS layout. This FIS instructs the
host to continue transferring DMA data from the host to the device.
5-18 C141-E249