Toshiba 3006GAL, 4006GAH, MK6006GAH 10.8.28 Read Buffer (E4h), 10.8.29 Write Buffer, 10.8.30Identify Device (ECh)

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10.8.28 Read Buffer (E4h)

COMMAND CODE			1 1 1 0 0 1 0 0	REGISTER
	REGISTER SETTING			NORMAL COMPLETION
DR		drive no.		no change
CY				no change
HD				no change
SN				no change
SC				00H
FT				no change

This command transfers a specified sector of data ( 512 bytes) from the 128kB buffer in the drive to the host. When this command is issued, the drive sets BSY, sets up the buffer for read operation, sets DRQ, resets BSY, and generates an interrupt. The host reads up to 512 bytes of data from the buffer.

10.8.29 Write Buffer			(E8h)
	COMMAND CODE			1 1 1 0 1 0 0 0	REGISTER
		REGISTER SETTING			NORMAL COMPLETION
	DR		drive no.		no change
	CY				no change
	HD				no change
	SN				no change
	SC				00H
	FT				no change

This command transfers a sector of data from the host to the specified 512 bytes of 128kB buffer of the drive . When this command is issued, the drive will set up the buffer for write operation, and set DRQ. The host may then write up to 512 bytes of data to the buffer.

10.8.30Identify Device (ECh)

COMMAND CODE			1 1 1 0 1 1 0 0	REGISTER
	REGISTER SETTING			NORMAL COMPLETION
DR		drive no.		no change
CY				no change
HD				no change
SN				no change
SC				00H
FT				no change

The identify device command requests the drive to transfer parameter information to the host. When the command is issued, the drive sets BSY, stores the required parameter information in the sector buffer, sets the DRQ bit, and issues an interrupt. The host may read the parameter information of the sector buffer. The parameter words in the buffer are arranged as shown in Table 10.8-1 ~ Table 10.8-5.

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