User Manual

SCSI Commands Reference Manual, Rev. J 438
www.seagate.com Parameters for direct access devices
5.3.26 Protocol-Specific Port mode page (19h) for SAS
This clause describes the Protocol-Specific Port mode page implemented by products that are SAS-3 compliant. The
Protocol-Specific Port mode page contains parameters that affect SSP target port operation. If the mode page is implemented
by one logical unit in a SCSI target device, then it shall be implemented by all logical units in the SCSI target device that support
the MODE SELECT or MODE SENSE commands.
The mode page policy (see 5.4.14) for this mode page shall be either shared or per target port. If a SAS target device has multiple
SSP target ports, then the mode page policy should be per target port.
Parameters in this mode page:
a) shall affect all phys in the SSP target port if the mode page policy is per target port; or
b) shall affect all SSP target ports in the SAS target device if the mode page policy is shared.
Table 410 defines the format of the page for SAS.
The PARAMETERS SAVEABLE (PS) bit is defined in 5.3.5.
The SPF bit shall be set to zero for access to the short format mode page.
The PAGE CODE field shall be set to 19h.
The PAGE LENGTH field shall be set to 0Eh.
Table 410 Protocol-Specific Port mode page for SAS
Bit
Byte
7 6 5 4 3 2 1 0
0 PS SPF (0b) PAGE CODE (19h)
1 PAGE LENGTH (0Eh)
2 Reserved
CONTINUE
AWT
BROADCAST
ASYNCHRONOUS
EVENT
READY LED
MEANING
PROTOCOL IDENTIFIER (6h)
3 Reserved
4 (MSB)
I_T NEXUS LOSS TIME
5 (LSB)
6 (MSB)
INITIATOR RESPONSE TIMEOUT
7 (LSB)
8 (MSB)
REJECT TO OPEN LIMIT
9 (LSB)
10 MAXIMUM ALLOWED XFER_RDY
11
Reserved. . .
15