Datasheet
7K500 OEM Specification
Page 55 of 176
immediately accessible, there is a delay while waiting for the spindle to reach
operating speed.
Idle Mode
Refer to the section of Adaptive Battery Life Extender Feature.
Active Mode
The device is in execution of a command or accessing the disk media with read
look-ahead function or write cache function.
12.5.2
12.5.212.5.2
12.5.2
Power Management Commands
Power Management Commands Power Management Commands
Power Management Commands
The Check Power Mode command allows a host to determine if a device is currently in, going to or
leaving standby mode.
The Idle and Idle Immediate commands move a device to idle mode immediately from the active or
standby modes. The idle command also sets the standby timer count and starts the standby timer.
The sleep command moves a device to sleep mode. The device’s interface becomes inactive at the
completion of the sleep command. A reset is required to move a device out of sleep mode. When a
device exits sleep mode it will enter standby mode.
The Standby and Standby Immediate commands move a device to standby mode immediately from
the active or idle modes. The standby command also sets the standby timer count.
12.5.3
12.5.312.5.3
12.5.3
Standby/Sleep command completion timing
Standby/Sleep command completion timing Standby/Sleep command completion timing
Standby/Sleep command completion timing
1.
Confirm the completion of writing cached data in the buffer to media
2.
Unload heads on the ramp
3.
Set DRDY bit and DSC bit in Status Register
4.
Activate the spindle break to stop the spindle motor
5.
Wait until spindle motor is stopped
6.
Perform post process
12.5.4
12.5.412.5.4
12.5.4
Status
Status Status
Status
In the active, idle and standby modes, the device shall have RDY bit of the status register set. If BSY
bit is not set, device shall be ready to accept any command.
In sleep mode, the device’s interface is not active. A host shall not attempt to read the device’s status
or issue commands to the device.
12.5.5
12.5.512.5.5
12.5.5
Interface Capability for Power Modes
Interface Capability for Power Modes Interface Capability for Power Modes
Interface Capability for Power Modes
Each power mode affects the physical interface as defined in the following table:
Mode BSY RDY Interface active Media
Active x x Yes Active
Idle 0 1 Yes Active
Standby 0 1 Yes Inactive
Sleep x x No Inactive
Table 34 Power conditions
Ready(RDY) is not a power condition. A device may post ready at the interface even though the
media may not be accessible.
12.5.6
12.5.612.5.6
12.5.6
Initial Power Mode at Power On
Initial Power Mode at Power On Initial Power Mode at Power On
Initial Power Mode at Power On
After power on the device goes to IDLE mode or STANDBY mode depending on the setting of the
Power Up in Standby Feature set