Xfer_Rdy Information Unit; Table 1.38 Xfer_Rdy Information Unit - Fujitsu MAU3147RC SERIES Technical Manual

Serial Attached SCSI (SAS) Interface
•
TAG field
The drive does not check for duplication of tags between multiple TASK
frames or between a COMMAND frame and a TASK frame, and the
duplication of a tag is therefore ignored.
•
CRC field
When a CRC error is detected, the drive sends the NAK primitive, and
discards the TASK frame.
•
Frame length
When the IU length is other than 28 bytes, the drive discards the TASK
frame.
•
LOGICAL UNIT NUMBER field
If this field is other than zero, the drive sets the response code to INVALID
LOGICAL UNIT NUMBER (0x09), and sends the RESPONSE frame of
RESPONSE DATA.
•
TASK MANAGEMENT FUNCTION field
If this field is other than ABORT TASK, ABORT TASK SET, CLEAR
TASK SET, LOGICAL UNIT RESET, or QUERY TASK, the drive sets the
response code to TASK MANAGEMENT FUNCTION NOT SUPPORTED
(0x04), and sends the RESPONSE frame of RESPONSE DATA.
1.6.2.3

XFER_RDY information unit

Table 1.38 defines the transfer ready IU. The XFER_RDY frame is sent by an
SSP TARG port to request write data from the SSP INIT port.
Bit
Byte
0 (MSB)
3
4 (MSB)
7
8
11
The REQUESTED OFFSET field contains the application client buffer offset of
the segment of write data that is sent to the SSP (initiator port as a logical unit).
The requested offset is a multiple of four (i.e., each DATA frame begins
transferring data on a dword boundary). The REQUESTED OFFSET field is
always zero for the first XFER_RDY frame of a command (drives do not support
the ENABLE FIRST BURST field of the COMMAND frame).
1-66

Table 1.38 XFER_RDY information unit

7 6 5
REQUESTED OFFSET
WRITE DATA LENGTH
4
3 2
Reserved
1
0
(LSB)
(LSB)
C141-C009