Fujitsu MHV2100AT Device Configuration Restore FR = C0h, Device Configuration Identify FR = C2h

5.3 Host Commands

•DEVICE CONFIGURATION RESTORE (FR = C0h)

The DEVICE CONFIGURATION RESTORE command disables any setting previously made by a DEVICE CONFIGURATION SET command and returns the content of the IDENTIFY DEVICE command response to the original settings as indicated by the data returned from the execution of a DEVICE CONFIGURATION IDENTIFY command. After execution of this command, the settings are kept for the device power down or reset.

If a Host Protected Area has been set by a SET MAX ADDRESS (EXT) command, or if DEVICE CONFIGURATION FREEZE LOCK is set, an aborted error is posted.

•DEVICE CONFIGURATION FREEZE LOCK (FR = C1h)

The DEVICE CONFIGURATION FREEZE LOCK command prevents accidental modification of the Device Configuration Overlay settings. After successful execution of a DEVICE CONFIGURATION FREEZE LOCK command, all

DEVICE CONFIGURATION SET, DEVICE CONFIGURATION FREEZE LOCK, DEVICE CONFIGURATION IDENTIFY, and DEVICE CONFIGURATION RESTORE commands are aborted by the device. The DEVICE CONFIGURATION FREEZE LOCK condition is cleared by a power- down, not cleared by a hardware or software reset.

If the device has executed a previous DEVICE CONFIGURATION FREEZE LOCK command since power-up, an aborted error is posted.

•DEVICE CONFIGURATION IDENTIFY (FR = C2h)

The DEVICE CONFIGURATION IDENTIFY command returns a 512-byte data structure is shown in Table 5.21. The content of this data structure indicates the selectable commands, modes, and feature sets that the device is capable of supporting. If a DEVICE CONFIGURATION SET command has been issued reducing the capabilities, the response to an IDENTIFY DEVICE command will reflect the reduced set of capabilities, while the DEVICE CONFIGURATION IDENTIFY command will reflect the entire set of selectable capabilities.

If the device has executed a previous DEVICE CONFIGURATION FREEZE LOCK command since power-up, an aborted error is posted.

•DEVICE CONFIGURATION SET (FR = C3h)

The DEVICE CONFIGURATION SET command allows reducing the set of optional commands, modes, or feature sets supported by a device as indicated by a DEVICE CONFIGURATION IDENTIFY command. The format of the overlay transmitted by the device is described in Table 5.21. As a result to the limitation of the function by the DEVICE CONFIGURATION SET command, is reflected in IDENTIFY information. When the bits in these words are cleared, the device no longer supports the indicated command, mode, or feature set. If a bit is set in the overlay transmitted by the device that is not set in the overlay received from a DEVICE CONFIGURATION IDENTIFY command, no action is taken for that

C141-E218 5-59