Hitachi IC25N040ATCS04-0 Specifications - Page 148

Read DMA C8h/C9h

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13.13 Read 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 Sector Number V V V V V V V V Cylinder Low V V V V V V V V Cylinder High V V V V V V V V Device/Head 1 L 1 D 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 Sector Number V V V V V V V V Cylinder Low V V V V V V V V Cylinder High V V V V V V V V Device/Head - - - - H H H H Status see below Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN VV0V0V0V Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 V 0 V - 0 -V Figure 98. Read DMA command (C8h/C9h) The Read DMA command reads one or more sectors of data from disk media and then transfers the data from the device to the host. It transfers the sectors 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 the DMARQ and are performed by the slave-DMA channel. The device issues only one interrupt per command to indicate that the data transfer has terminated and that status is available. If an uncorrectable error occurs, the read will be terminated at the failing sector. Output parameters to the device Sector Count This indicates the number of continuous sectors to be transferred. If zero is specified, then 256 sectors will be transferred. Sector Number This indicates the sector number of the first sector to be transferred. (L = 0). In LBA mode, this register specifies that LBA address bits 0-7 are to be transferred. (L = 1) Cylinder High/Low This indicates the cylinder number of the first sector to be transferred. (L = 0) In LBA mode, this register specifies LBA address bits 8-15 (Low) and 16-23 (High) to be transferred. (L = 1) H This indicates the head number of the first sector to be transferred. (L = 0) In LBA mode this register specifies the LBA bits 24-27 to be transferred. (L = 1) R This indicates the retry bit, but this bit is ignored. Hitachi Travelstar 60GH & 40GN hard disk drive specifications 135

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13.13 Read DMA (C8h/C9h)
see below
Status
1 1 0 0 1 0 0 R
Command
- - - - H H H H
Device/Head
1 L 1 D H H H H
Device/Head
V V V V V V V V
Cylinder High
V V V V V V V V
Cylinder High
V V V V V V V V
Cylinder Low
V V V V V V V V
Cylinder Low
V V V V V V V V
Sector Number
V V V V V V V V
Sector Number
V V V V V V V V
Sector Count
V V V V V V V V
Sector Count
see below
Error
- - - - - - - -
Feature
- - - - - - - -
Data
- - - - - - - -
Data
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Register
Command Block Input Registers
Command Block Output Registers
V
-
0
-
V
0
V
0
V
0
V
0
V
0
V
V
ERR
IDX
COR
DRQ
DSC
DF
RDY
BSY
AMN
T0N
ABT
0
IDN
0
UNC
CRC
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Status Register
Error Register
Figure 98. Read DMA command (C8h/C9h)
The Read DMA command reads one or more sectors of data from disk media and then transfers the data
from the device to the host.
It
transfers the sectors 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
the DMARQ and are performed by the slave-DMA channel. The device issues only one interrupt per
command to indicate that the data transfer has terminated and that status is available.
If an uncorrectable error occurs, the read will be terminated at the failing sector.
Output parameters to the device
Sector Count
This indicates the number of continuous sectors to be transferred. If zero is
specified, then 256 sectors will be transferred.
Sector Number
This indicates the sector number of the first sector to be transferred. (L = 0).
In LBA mode, this register specifies that LBA address bits 0–7 are to be
transferred. (L = 1)
Cylinder High/Low
This indicates the cylinder number of the first sector to be transferred. (L = 0)
In LBA mode, this register specifies LBA address bits 8–15 (Low) and
16–23 (High) to be transferred. (L = 1)
H
This indicates the head number of the first sector to be transferred. (L = 0)
In LBA mode this register specifies the LBA bits 24–27 to be transferred. (L = 1)
R
This indicates the retry bit
,
but this bit is ignored.
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
135