IBM DTNA-22160 Hard Drive Specifications - Page 69

Standby timer, Status, Interface Capability for Power Modes, Initial Power Mode at Power

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5. Wait 1.5 Sec to spindle motor is stopped 6. Perform post process 10.4.4 Standby timer The standby timer provides a method for the device to automatically enter standby mode from either active or idle mode following a host programmed period of inactivity. If the device is in the active or idle mode, the device waits for the specified time period and if no command is received, the device automatically enters the standby mode. If the value of SECTOR C O U N T register on Idle command or Standby command is set to 00h, the device will automatically set the standby timer to 109 minutes. 10.4.5 Status In the active, idle and standby modes, the device shall have R D Y bit of the status register set. If BSY bit is not set, the 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. 10.4.6 Interface Capability for Power Modes The each power mode affects the physical interface as defined in the following table: Mode Active Idle Standby Sleep BSY RDY Interface active x x Yes o 1 Yes o 1 Yes x x No Media Active Active Inactive Inactive Figure 39. 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. Though the interface is inactive in sleep mode, the access to the interface registers and the validity of I N T R Q is guaranteed for two seconds after Sleep command is completed. After this period, the contents of interface registers may be lost. Since the contents of interface registers may be invalid, host should NOT check Status register nor Alternate Status register prior to issuing soft reset to wake up a device. 10.4.7 Initial Power Mode at Power On After power on or hard reset the device goes to IDLE mode or STNADBY mode depending on the option. Refer 3.3.7.2, " Operating mode at power on" on page 14 for the intial power mode selection. General Operation Descriptions 61

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5.
Wait 1.5 Sec to spindle motor is stopped
6.
Perform post process
10.4.4
Standby timer
The standby timer provides a method for the device to automatically enter standby mode from either active
or idle mode following a host programmed period of inactivity.
If the device is in the active or idle mode,
the device waits for the specified time period and if no command is received, the device automatically enters
the standby mode.
If the value of SECTOR COUNT register on Idle command or Standby command is set to 00h, the device
will automatically set the standby timer to 109 minutes.
10.4.5
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, the 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.
10.4.6
Interface Capability for Power Modes
The 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
o
1
Yes
Active
Standby
o
1
Yes
Inactive
Sleep
x
x
No
Inactive
Figure 39. 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.
Though the interface is inactive in sleep mode, the access to the interface registers and the validity of INTRQ
is guaranteed for two seconds after Sleep command is completed. After this period, the contents of interface
registers may be lost. Since the contents of interface registers may be invalid, host should NOT check Status
register nor Alternate Status register prior to issuing soft reset to wake up a device.
10.4.7
Initial Power Mode at Power On
After power on or hard reset the device goes to IDLE mode or STNADBY mode depending on the option.
Refer 3.3.7.2, “ Operating mode at power on” on page 14 for the intial power mode selection.
General Operation Descriptions
61