5.2 Logical Interface

5.2.3.9 Set Device Bits - Device to Host

Error

R Status Hi R Status Lo R I R Reserved (0)

FIS Type (A1h)

0

SActive 31:0

1

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.

Status-Hi -

Contains the new value of bits 6, 5, and 4 of the Status register of

 

the Shadow Register Block.

Status-Lo -

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 bit-significant and the device sets bit

 

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.

C141-E280

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