5.2 Logical Interface
5.2.3.9 Set Device Bits – Device to Host
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Error | R Status Hi R Status Lo | R | I | R | Reserved (0) | FIS Type (A1h) |
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SActive 31:0
Figure 5.11 Set Device Bits FIS
The Set Device Bits -
Device to Host FIS is used by the device to load Shadow Command Block bits for which the device has exclusive write access. These bits are the eight bits of the Error register and six of the eight bits of the Status register. This FIS does not alter bit 7, BSY, or bit 3, DRQ, of the Shadow Status register.
FIS Type - | Set to a value of A1h. Defines the rest of the FIS fields. Defines the |
| length of the FIS as two Dwords. |
I - | Interrupt Bit. This bit signals the host adapter to enter an interrupt |
| pending state if both the BSY bit and the DRQ bit in the shadow |
| Status register are zero when the frame is received. |
Error - | Contains the new value of the Error register of the Shadow Register |
| Block. |
Contains the new value of bits 6, 5, and 4 of the Status register of | |
| the Shadow Register Block. |
Contains the new value of bits 2,1, and 0 of the Status register of | |
| the Shadow Register Block. |
SActive - | The SActive field of the Set Device Bits FIS communicates |
| successful completion notification for each of up to 32 queued |
| commands. The field is |
| positions to one for each command tag it is indicating successful |
| completion notification for. The device may set more than one bit |
| to one if it is explicitly aggregating successful status returns. The |
| device shall only indicate completion notification for a command if |
| it has completed successfully. |