4.4 Various Processes

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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

4.4.7.1Power 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

Pre-idle mode

Idle mode

Standby mode

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.

C156-E205-01EN

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Fujitsu MCJ3230AP manual Power management function, Power mode, Active mode, Pre-idle mode