User Manual

SCSI Commands Reference Manual, Rev. J 502
www.seagate.com Parameters for direct access devices
5.4.15 Power Conditions Vital Product Data page (8Ah)
The Power Condition VPD page (see table 475) indicates which power conditions (see SPC-5) are supported by the logical unit and provides
information about how those power conditions operate.
PERIPHERAL QUALIFIER field and PERIPHERAL DEVICE TYPE field
The PERIPHERAL QUALIFIER field and the PERIPHERAL DEVICE TYPE field are defined in standard INQUIRY data (see 3.6.2).
PAGE CODE field and PAGE LENGTH field
These fields are defined in SPC-5, and shall be set to the value shown in table 475 for the Power Condition VPD page.
If set to one, a power condition support bit (i.e., the STANDBY_Y bit, the STANDBY_Z bit, the IDLE_C bit, the IDLE_B bit, and the IDLE_A bit) indi-
cates that:
a) the associated power condition may be entered with the START STOP UNIT command (see SBC-4) if that command is implemented; and
b) the associated power condition may be entered with a power condition timer if the associated timer is supported and
enabled
(see 5.3.20).
STANDBY_Y power conditions support bit
1 This bit set to one indicates that the logical unit supports the standby_y power condition as described in this subclause.
0 This bit set to zero indicates that the logical unit does not support the standby_y power condition.
STANDBY_Z power conditions support bit
1 This bit set to one indicates that the logical unit supports the standby_z power condition as described in this subclause.
0 This bit set to zero indicates that the logical unit does not support the standby_z power condition.
IDLE_C power conditions support bit
1 This bit set to one indicates that the logical unit supports the idle_c power condition as described in this subclause.
0 A IDLE_C bit set to zero indicates that the logical unit does not support the idle_c power condition.
Table 475 Power Condition VPD page
Bit
Byte
7 6 5 4 3 2 1 0
0 PERIPHERAL QUALIFIER PERIPHERAL DEVICE TYPE
1 PAGE CODE (8Ah)
2 (MSB)
PAGE LENGTH (000Eh)
3 (LSB)
4 Reserved STANDBY_Y STANDBY_Z
5 Reserved IDLE_C IDLE_B IDLE_A
6 (MSB)
STOPPED CONDITION RECOVERY TIME
7 (LSB)
8 (MSB)
STANDBY_Z CONDITION RECOVERY TIME
9 (LSB)
10 (MSB)
STANDBY_Y CONDITION RECOVERY TIME
11 (LSB)
12 (MSB)
IDLE_A CONDITION RECOVERY TIME
13 (LSB)
14 (MSB)
IDLE_B CONDITION RECOVERY TIME
15 (LSB)
16 (MSB)
IDLE_C CONDITION RECOVERY TIME
17 (LSB)