Interface
If the device has executed a previous DEVICE CONFIGURATION FREEZE LOCK command since
•DEVICE CONFIGURATION IDENTIFY (FR=C2h)
The DEVICE CONFIGURATION IDENTIFY command returns a 512 byte data structure is shown in Table 5.16. 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
•DEVICE CONFIGURATION SET (FR=C3h)
The DEVICE CONFIGURATION SET command allows to reduce 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 5.16. The DEVICE CONFIGURATION SET command transfers an overlay that modifies some of the bits set in words 63, 82, 83, 84, and 88 of the IDENTIFY DEVICE command response. 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 bit. After execution of this command, the settings are kept for the device power down or reset.
If the restriction of Multiword DMA modes or Ultra DMA modes is executed, a SET FEATURES command should be issued for the modes restriction prior the DEVICE CONFIGURATION SET command is issued.
If a DEVICE CONFIGURATION SET command has already modified the original settings as reported by a DEVICE CONFIGURATION IDENTIFY command, if DEVICE CONFIGURATION FREEZE LOCK is set, if any of the bit modification restrictions described are violated, or if a Host Protected Area has been established by the execution of a SET MAX ADDRESS command, an aborted error is posted.
