Hitachi HTS543212L9SA00, HTS543280L9A300 manual Read DMAC8h/C9h, Read DMA Command C8h/C9h

5K320 SATA OEM Specification

14.14Read DMA(C8h/C9h)

Command Block Output Registers

Register	7	6	5	4	3	2	1	0
Data	-	-	-	-	-	-	-	-
Feature	-	-	-	-	-	-	-	-
Sector Count	V	V	V	V	V	V	V	V
LBA Low	V	V	V	V	V	V	V	V
LBA Mid	V	V	V	V	V	V	V	V
LBA High	V	V	V	V	V	V	V	V
Device	-	L	-	-	H	H	H	H
Command	1	1	0	0	1	0	0	R

Command Block Input Registers

Register	7	6		5	4	3	2	1	0
Data	-	-		-	-	-	-	-	-
Error			...See Below...
Sector Count	V	V		V	V	V	V	V	V
LBA Low	V	V		V	V	V	V	V	V
LBA Mid	V	V		V	V	V	V	V	V
LBA High	V	V		V	V	V	V	V	V
Device	-	-		-	-	H	H	H	H
Status			...See Below...

Error Register

7	6	5	4	3	2	1	0
CRC	UNC	0	IDN	0	ABT	T0N	AM
							N
V	V	0	V	0	V	0	0

Status Register

7	6	5	4	3	2	1	0
BSY	RDY	DF	DSC	DRQ	COR	IDX	ERR
0	V	0	V	-	0	0	V

Table 69 Read DMA Command (C8h/C9h)

The Read DMA command reads one or more sectors of data from disk media, then transfers the data from the device to the host.

The sectors are transferred through the Data Register 16 bits at a time.

The host initializes a slave-DMA channel prior to issuing the command. The data transfers are qualified by DMARQ and are performed by the slave -DMA channel. The device issues only one interrupt per command to indicate that data transfer has terminated and status is available.

If an uncorrectable error occurs, the read will be terminated at the failing sector.

Output Parameters To The Device

Sector Count	The number of continuous sectors to be transferred. If zero is specified, then 256 sectors
	will be transferred.
LBA Low	The sector number of the first sector to be transferred. (L=0)
	In LBA mode, this register specifies LBA address bits 0 - 7 to be transferred. (L=1)
LBA High/Mid	The cylinder number of the first sector to be transferred. (L=0)
	In LBA mode, this register specifies LBA address bits 8 - 15 (Mid) 16 - 23 (High) to be
	transferred. (L=1)
H	The head number of the first sector to be transferred. (L=0)
	In LBA mode, this register specifies LBA bits 24-27 to be transferred. (L=1)
R	The retry bit, but this bit is ignored.
Input Parameters From The Device
Sector Count	The number of requested sectors not transferred. This will be zero, unless an
	unrecoverable error occurs.
LBA Low	The sector number of the last transferr ed sector. (L=0)
	In LBA mode, this register contains current LBA bits 0 - 7. (L=1)
LBA High/Mid	The cylinder number of the last transferred sector. (L=0)
	In LBA mode, this register contains current LBA bits 8 - 15 (Mid), 16 - 23 (High).
	(L=1)
H	The head number of the sector to be transferred. (L=0)
	In LBA mode, this register contains current LBA bits 24 - 27. (L=1)

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