Fujitsu MPF3XXXAH manual

At command issuance (I/O registers setting contents)

1F7H(CM)	1	1	1	0		1	1	1	1
1F6H(DH)	×	×	×		DV			xx
1F5H(CH)						xx
1F4H(CL)						xx
1F3H(SN)						xx
1F2H(SC)				xx or transfer mode
1F1H(FR)				[See Table 5.6]

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

1F7H(ST)				Status information
1F6H(DH)	×	×	×		DV	xx
1F5H(CH)					xx
1F4H(CL)					xx
1F3H(SN)					xx
1F2H(SC)					xx
1F1H(ER)				Error information

The host sets X'03' to the Features register. By issuing this command with setting a value to the Sector Count register, the transfer mode can be selected. Upper 5 bits of the Sector Count register defines the transfer type and lower 3 bits specifies the binary mode value.

However, the IDD can operate with the PIO transfer mode 4 and multiword DMA transfer mode 2 regardless of reception of the SET FEATURES command for transfer mode setting.

The IDD supports following values in the Sector Count register value. If other value than below is specified, an ABORTED COMMAND error is posted.

PIO default transfer mode	00000	000	(X‘00’)
PIO flow control transfer mode X	00001	000	(X‘08’: Mode 0)
	00001	001	(X‘09’: Mode 1)
	00001	010	(X‘0A’: Mode 2)
	00001	011	(X‘0B’: Mode 3)
	00001	100	(X‘0C’: Mode 4)
Multiword DMA transfer mode X	00100 000 (X‘20’: Mode 0)
	00100	001	(X‘21’: Mode 1)
	00100	010	(X‘22’: Mode 2)
Ultra DMA transfer mode X	01000 000		(X‘40’: Mode 0)
	01000	001	(X‘41’: Mode 1)
	01000	010	(X‘42’: Mode 2)
	01000	011	(X‘43’: Mode 3)
	01000	100	(X‘44’: Mode 4)

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