User Manual

SCSI Commands Reference Manual, Rev. J 444
www.seagate.com Parameters for direct access devices
5.3.28 Shared Port Control mode page (19h/02h)
The Port Control Mode Page contains parameters that affect SAS 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 shared.
Table 416 defines the format of this mode page.
The Parameters Saveable (PS) bit is defined in 5.3.5.
The SubPage Format (SPF) bit is defined in 5.3.5 and shall be set to the value defined in table 416.
The PAGE CODE field is defined in 5.3.5 and shall be set to the value defined in table 416.
The SUBPAGE CODE field is defined in 5.3.5 and shall be set to the value defined in table 416.
The PAGE LENGTH field is defined in 5.3.5 and shall be set to the value defined in table 416.
PROTOCOL IDENTIFIER field
The PROTOCOL IDENTIFIER field is defined in 5.3.5 and shall be set to the value defined in table 416 indicating that this is a SAS SSP specific
mode page.
POWER LOSS TIMEOUT field
The POWER LOSS TIMEOUT field contains the maximum time, in one millisecond increments, that a target port shall respond to connection
requests with OPEN_REJECT (RETRY) after receiving NOTIFY (POWER LOSS EXPECTED) (see SAS-3). A POWER LOSS TIMEOUT field set to 0000h
specifies that the maximum time is vendor-specific. The power loss timeout shall be restarted on each NOTIFY (POWER LOSS EXPECTED) that is
received.
POWER GRANT TIMEOUT field
The POWER GRANT TIMEOUT field contains the minimum time, in one second increments, that a SAS target device shall wait to receive a
PWR_GRANT from a power source device. A POWER GRANT TIMEOUT field set to 00h specifies that the time limit is vendor specific.
Table 416 Shared Port Control Mode Page
Bit
Byte
7 6 5 4 3 2 1 0
0
PS SPF (1b) PAGE CODE (19h)
1
SUBPAGE CODE (02h)
2 (MSB)
PAGE LENGTH (000Ch)
3 (LSB)
4 Reserved
5 Reserved
PROTOCOL IDENTIFIER (6h)
6 (MSB)
POWER LOSS TIMEOUT
7 (LSB)
8 Reserved
9 POWER GRANT TIMEOUT
10
Reserved. . .
15