Toshiba 3006GAL, 4006GAH, MK6006GAH 10.8.23 Read DMA, 10.8.24 Read DMA EXT

360050398

10.8.23 Read DMA			(C8h/C9h)
	COMMAND CODE			1 1 0 0 1 0 0 X	REGISTER
		REGISTER SETTING			NORMAL COMPLETION
	DR		drive no.		no change
	CY		starting cylinder		last possible
	HD		starting head		last possible
	SN		starting sector		last possible
	SC		no. of sector to read		00H
	FT				no change
	LBA		staring address		last address

This command is basically identical to Sector command except following features.

•Host initialize the DMA channel before issuing command.

-Data transfer is initiated by DMARQ and handled by the DMA channel in the host.

-Drive issues only one interrupt at the completion of each command to show the status is valid after data transfer.

During DMA transfer phase, either BSY or DRQ is set to 1.

When a command is completed, CY, HD, SN register (LBA register) shows the sector transferred the latest.

If the drive detects unrecoverable error, the drive terminate the command and CY, HD, SN register (LBA register) shows the sector where error occurred.

10.8.24 Read DMA EXT			(25h)
	COMMAND CODE		0 0 1 0 0 1 0 1		REGISTER
			REGISTER SETTING	NORMAL COMPLETION
	DR		drive no.		no change
	LBA	Current	LBA(7:0)	HOB=0		last address
	Low	Previous	LBA(31:24)	HOB=1		last address
	LBA	Current	LBA(15:8)	HOB=0		last address
	Mid	Previous	LBA(39:32)	HOB=1		last address
	LBA	Current	LBA(23:16)	HOB=0		last address
	High	Previous	LBA(47:40)	HOB=1		last address
	SC	Current	sector count(7:0)	HOB=0		00H
		Previous	sector count(15:8)	HOB=1		00H
	FT	Current	reserved	HOB=0		no change
		Previous	reserved	HOB=1		no change

This command is basically identical to Read DMA command except register setting.

This command is available in LBA addressing only.

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