Fujitsu MHR2010AT Product Manual page 166

Interface
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 power-up, an aborted error is posted.
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.
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