Fujitsu MHD2021AT, MHC2032AT, MHC2040AT, MHD2032AT manual Initialize Device Parameters X’91’

Interface

At command issuance (I/O registers setting contents)

1F7H(CM)	0	1	1	1	x	x	x	x
1F6H(DH)	×	L	×	DV	Head No. /LBA [MSB]
1F5H(CH)	Cylinder No. [MSB] / LBA
1F4H(CL)	Cylinder No. [LSB] / LBA
1F3H(SN)	Sector No. / LBA [LSB]
1F2H(SC)	xx
1F1H(FR)	xx

At command completion (I/O registers contents to be read)

1F7H(ST)	Status information
1F6H(DH)	×	L	×	DV	Head No. /LBA [MSB]
1F5H(CH)	Cylinder No. [MSB] / LBA
1F4H(CL)	Cylinder No. [LSB] / LBA
1F3H(SN)	Sector No. / LBA [LSB]
1F2H(SC)	xx
1F1H(ER)	Error information

(11) INITIALIZE DEVICE PARAMETERS (X’91’)

The host system can set the number of sectors per track and the maximum head number (maximum head number is “number of heads minus 1”) per cylinder with this command. Upon receipt of this command, the device sets the BSY bit of Status register and saves the parameters. Then the device clears the BSY bit and generates an interrupt.

When the SC register is specified to X’00’, an ABORTED COMMAND error is posted. Other than X’00’ is specified, this command terminates normally.

The parameters set by this command are retained even after reset or power save operation regardless of the setting of disabling the reverting to default setting.

In LBA mode

The device ignores the L bit specification and operates with the CHS mode specification. An accessible area of this command within head moving in the LBA mode is always within a default area. It is recommended that the host system refers the addressable user sectors (total number of sectors) in word 60 to 61 of the parameter information by the IDENTIFY DEVICE command.

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