Hitachi IC25N040ATCS04-0 Specifications - Page 94

Standby timer, 6.5 Status, 6.6 Interface Capability for Power Modes, 6.7 Initial Power Mode

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11.6.4 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 the SECTOR COUNT register on Idle command or the Standby command is set to "00h", the device will automatically set the standby timer to 109 minutes. 11.6.5 Status In the active, idle, and standby modes, the device shall have the RDY bit of the status register set. If the 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 status of the device or issue commands to the device. 11.6.6 Interface Capability for Power Modes Each power mode affects the physical interface as defined in the following table: Mode BSY Active x Idle o Standby o Sleep x Interface RDY active Media x Yes Active 1 Yes Active 1 Yes Inactive x No Inactive Figure 62. 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. The interface is inactive in sleep mode, but the access to the interface registers and the validity of INTRQ is guaranteed for two seconds after the Sleep command is completed. After this period, the contents of interface registers may be lost. Since the contents of interface registers may be invalid, the host should NOT check the Status register nor the Alternate Status register prior to issuing a soft reset to wake up a device. 11.6.7 Initial Power Mode at Power On After power on or hard reset the device goes to IDLE mode or STANDBY mode depending on the option. Refer to section 4.4.3, "Operating Modes" on page 17 for the initial power mode selection. Hitachi Travelstar 60GH & 40GN hard disk drive specifications 81

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11.6.4 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 automa-
tically enters the standby mode.
If the value of the SECTOR COUNT register on Idle command or the Standby command is set to "00h",
the device will automatically set the standby timer to 109 minutes.
11.6.5 Status
In the active, idle, and standby modes, the device shall have the RDY bit of the status register set. If the
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 status of the device
or issue commands to the device.
11.6.6 Interface Capability for Power Modes
Each power mode affects the physical interface as defined in the following table:
Inactive
No
x
x
Sleep
Inactive
Yes
1
o
Standby
Active
Yes
1
o
Idle
Active
Yes
x
x
Active
Media
Interface
active
RDY
BSY
Mode
Figure 62. 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.
The interface is inactive in sleep mode, but the access to the interface registers and the validity of INTRQ
is guaranteed for two seconds after the Sleep command is completed. After this period, the contents of
interface registers may be lost. Since the contents of interface registers may be invalid, the host should
NOT check the Status register nor the Alternate Status register prior to issuing a soft reset to wake up a
device.
11.6.7 Initial Power Mode at Power On
After power on or hard reset the device goes to IDLE mode or STANDBY mode depending on the option.
Refer to section 4.4.3, "Operating Modes" on page 17 for the initial power mode selection.
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
81