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7K200 SATA OEM Specification

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14.43 Write DMA (CAh/CBh)

Command Block Output Registers

Command Block Input Registers

7 6 5 4 3 2 1 0 Register

7 6 5 4 3 2 1 0

Data

- - - - -

- Data

- - - - - -

Feature

- - - - -

- Error

...See

Below...

Sector Count

V V V V V V V V Sector Count

V V V V V V V V

LBA Low

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 Mid

V V V V V V V V

LBA High

V V V V V V V V LBA High

V V V V V V V V

Device

- L - - H H H H Device

- - - - H H H H

Command

1 1 0 0 1 0 1 R Status

...See

Below...

Error Register

Status Register

7 6 5 4 3 2 1 0

CRC UNC 0

IDN

0 ABT T0N

BSY RDY

DF DSC DRQ

COR IDX

ERR

V 0 0 V 0 V 0 0

0 V V V - 0 0 V

Table 127 Write DMA Command (CAh/CBh)

The Write DMA command transfers one or more sectors of data from the host to the device, then

the data is written to the disk media.

The sectors of data are transferred through the Data Register 16 bits at a time.
The host initializes a slave-DMA channel prior to issuing the command. 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 write 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 contains LBA bits 0 - 7. (L=1)

LBA High/Mid

The cylinder number of the first sector to be transferred. (L=0)

In LBA mode, this register contains LBA bits 8 - 15 (Mid), 16 - 23 (High).
(L=1)

The head number of the first sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 24 - 27. (L=1)

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 transferred 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)

The head number of the last transferred sector. (L=0) In LBA mode, this register
contains current LBA bits 24 - 27. (L=1)