Hitachi hard disk 0J11285 500 GB 2.5 " 8 MB 0J11285 Ficha De Dados
Códigos do produto
0J11285
Z5K500 OEM Specifications
101
14.14 Read DMA(C8h/C9h)
Command Block Output Registers
Command Block Input Registers
Register
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 0 R Status
...See
Below...
Error Register
Status Register
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
CRC UNC 0
IDN
0
ABT T0N AMN BSY RDY
DF
DSC DRQ COR IDX ERR
V V 0 V 0 V 0 0
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.
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.
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
Sector Count
The number of continuous sectors to be transferred. If zero is specified, then
256 sectors will be transferred.
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)
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)
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)
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
Sector Count
The number of requested sectors not transferred. This will be zero, unless an
unrecoverable error occurs.
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)
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)
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)
In LBA mode, this register contains current LBA bits 24 - 27. (L=1)