Fujitsu MPD3XXXAT manual Features register values and settable modes, ‘Aa’, ‘Ab’, ‘Bb’, ‘Cc’

	Table 5.6 Features register values and settable modes
Features Register	Drive operation mode
X‘02’	Enables the write cache function.
X‘03’	Specifies the transfer mode. Supports PIO mode 4, single word DMA mode
	2, and multiword DMA mode regardless of Sector Count register contents.
X‘04’	No operation.
X‘05’	Enable the advanced power management function.
X‘33’	No operation.
X‘54’	No operation.
X‘55’	Disables read cache function.
X‘66’	Disables the reverting to power-on default settings after software reset.
X‘77’	No operation.
X‘81’	No operation.
X‘82’	Disables the write cache function.
X‘84’	No operation.
X‘85’	Disable the advanced power management function.
X‘88’	No operation.
X‘89’	No operation.
X‘AA’	Enables the read cache function.
X‘AB’	No operation.
X‘BB’	Specifies the transfer of 4-byte ECC for READ LONG and WRITE LONG
	commands.
X‘CC’	Enables the reverting to power-on default settings after software reset.

At power-on or after hardware reset, the default mode is the same as that is set with a value greater than X‘AA’ (except for write cache). If X‘66’ is specified, it allows the setting value greater than X‘AA’ which may have been modified to a new value since power-on, to remain the same even after software reset.

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