Fujitsu MJA2500BH Maintenance Manual - Page 89

Register - Host to Device, Register - Host to Device FIS layout, LBA Mid exp

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5.2 Logical Interface 5.2.3.2 Register - Host to Device The Register - Host to Device FIS has the following layout: 33222222222211111111119876543210 1098765432109876543210 0 Features Command C R R Reserved (0) FIS Type (27h) 1 Device LBA High LBA Mid LBA Low Features (exp) 2 LBA High (exp) LBA Mid (exp) LBA Low (exp) 3 Control Reserved (0) Sector Count (exp) Sector Count 4 Reserved (0) Reserved (0) Reserved (0) Reserved (0) 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-E293 5-15

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5.2
Logical Interface
C141-E293
5-15
5.2.3.2 Register - Host to Device
The Register - Host to Device 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
9
8 7 6 5 4 3
2
1
0
Features
Command
CRR
Reserved (0)
FIS Type (27h)
0
Device
LBA High
LBA Mid
LBA Low
1
Features (exp)
LBA High (exp)
LBA Mid (exp)
LBA Low (exp)
2
Control
Reserved (0)
Sector Count (exp)
Sector Count
3
Reserved (0)
Reserved (0)
Reserved (0)
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.