Fujitsu MHD2021AT, MHC2032AT, MHC2040AT, MHD2032AT manual Read Multiple X’C4’

Interface

Command block registers contain the cylinder, the head, and the sector addresses of the sector (in the CHS mode) or the logical block address (in the LBA mode) where the error occurred, and remaining number of sectors of which data was not transferred.

At command issuance (I/O registers setting contents)

1F7H(CM)	0	0	1	0	0	0	0	R
1F6H(DH)	×	L	×	DV	Start head No. /LBA [MSB]
1F5H(CH)	Start cylinder No. [MSB] / LBA
1F4H(CL)	Start cylinder No. [LSB] / LBA
1F3H(SN)	Start sector No. / LBA [LSB]
1F2H(SC)	Transfer sector count
1F1H(FR)	xx

R= 0 →with Retry R = 1 →without Retry

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

1F7H(ST)	Status information
1F6H(DH)	×	L	×	DV	End head No. /LBA [MSB]
1F5H(CH)	End cylinder No. [MSB] / LBA
1F4H(CL)	End cylinder No. [LSB] / LBA
1F3H(SN)	End sector No. / LBA [LSB]
1F2H(SC)	00 (*1)
1F1H(ER)	Error information

*1 If the command is terminated due to an error, the remaining number of sectors of which data was not transferred is set in this register.

(2) READ MULTIPLE (X’C4’)

This command operates similarly to the READ SECTOR(S) command. The device does not generate an interrupt (assertion of the INTRQ signal) on each every sector. An interrupt is generateed after the transfer of a block of sectors for which the number is specified by the SET MULTIPLE MODE command.

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