Read Dma(C8H/C9H); Table 70 Read Dma Command (C8H/C9H) - Hitachi 7K320 - Travelstar Mobile Hard Drive Specifications

14.14

Read DMA(C8h/C9h)

Command Block Output Registers
Register
Data
Feature
Sector Count
LBA Low
LBA Mid
LBA High
Device
Command
Error Register
7 6 5 4
CRC UNC 0 IDN
V V 0 V

Table 70 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
LBA Low
LBA High/Mid
H
R
Input Parameters From The Device
Sector Count
LBA Low
LBA High/Mid
H
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
- L - - H H H H
1 1 0 0 1 0 0 R
3 2 1 0
0 ABT T0N AM
N
0 V 0 0
The number of continuous sectors to be transferred. If zero is specified, then 256 sectors
will be transferred.
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)
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)
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)
The retry bit, but this bit is ignored.
The number of requested sectors not transferred. This will be zero, unless an
unrecoverable error occurs.
The sector number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 0 - 7. (L=1)
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 sector to be transferred. (L=0)
In LBA mode, this register contains current LBA bits 24 - 27. (L=1)
Page 105 of 176
7K320 (SATA) OEM Specification
Command Block Input Registers
Register
Data
Error
Sector Count
LBA Low
LBA Mid
LBA High
Device
Status
Status Register
7 6 5 4
BSY RDY DF DSC DRQ COR IDX ERR
0 V 0 V
7 6 5 4 3 2 1 0
- - - - - - - -
...See Below...
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
- - - - H H H H
...See Below...
3 2 1 0
- 0 0 V