Fujitsu MHF2021AT, MHF2043AT, MHE2043AT, MHE2064AT manual Features register values and settable modes

	5.3 Host Commands
Table 5.5 Features register values and settable modes
Features Register	Drive operation mode
X’02’	Enables the write cache function.
X’03’	Transfer mode depends on the contents of the Sector Count register.
	(Details are given later.)
X’05’	Enables the advanced power management function.
X’55’	Disables read cache function.
X’66’	Disables the reverting to power-on default settings after software reset.
X’82’	Disables the write cache function.
X’85’	Disables the advanced power management function.
X’AA’	Enables the read cache function.
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’85’ (except for write cache). If X’66’ is specified, it allows the seting 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.

C141-E057-01EN 5-39