Fujitsu MHV2040BH, Product Manual, Page: 97 / 276

5.2 Logical Interface
C141-E224 5-23
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.