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4.4 Various Processes
C156-E205-01EN 4-17
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The GET MEDIA STATUS command is enabled.
!
The Eject switch is disabled.
The media status notification function is disabled at power-on reset, software reset,
when the DEVICE RESET command is received, or when the EXECUTE
DEVICE DIAGNOSTIC command is received.
4.4.7 Power management function
The ODD provides the power management function that minimizes the power
consumed. For this function, the ODD has some control commands and a timer.
The host uses the functions below to control the power management function.
1) Standby timer
2) Idle Immediate command
3) Sleep command
4) Standby Immediate command
4.4.7.1 Po
w
er mode
The ODD supports power modes shown below. The ODD uses a power mode
equivalent to standby mode, except that the DRDY bit is 0 while media is not
mounted.
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Active mode
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Pre-idle mode
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Idle mode
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Standby mode
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Sleep mode
4.4.7.2 Active mode
In active mode, all circuits are enabled. The ODD requires the shortest time to
start processing a command.
4.4.7.3 Pre-idle mode
In pre-idle mode, the read/write circuits stop. The ODD can receive a command
from the host, but since some circuits stop, the command requires 20 ms to access
media.
The ODD automatically enters pre-idle mode if no command is issued within a
specified time (0.5 second) in active mode. When it receives an access command,
the ODD automatically enters active mode. The pre-idle mode cannot be
controlled from the host computer.