IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 142

Read DMA C8h/C9h

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11.13 Read DMA (C8h/C9h) Command Block Output Registers Register 76543210 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 1100100R Command Block Input Registers Register 76543210 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 111. 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. 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, 256 sectors will be transferred. Sector Number The sector number of the first sector to be transferred. (L=0) In LBA mode this register specifies the transfer of LBA address bits 0 - 7. (L=1) Cylinder High/Low The cylinder number of the first sector to be transferred. (L=0) In LBA mode this register specifies the transfer of LBA address bits 8 - 15 (Low) 16 - 23 (High). (L=1) H The head number of the first sector to be transferred. (L=0) In LBA mode this register specifies the transfer of LBA bits 24-27. (L=1) Deskstar 120GXP hard disk drive specifications 128

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11.13 Read DMA (C8h/C9h)
see below
Status
1100100R
Command
----HHHH
Device/Head
1L1DHHHH
Device/Head
VVVVVVVV
Cylinder High
VVVVVVVV
Cylinder High
VVVVVVVV
Cylinder Low
VVVVVVVV
Cylinder Low
VVVVVVVV
Sector Number
VVVVVVVV
Sector Number
VVVVVVVV
Sector Count
VVVVVVVV
Sector Count
see below
Error
--------
Feature
--------
Data
--------
Data
76543210
Register
76543210
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 111. 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.
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 com-
mand 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,
256 sectors will be transferred.
Sector Number
The sector number of the first sector to be transferred. (L=0)
In LBA mode this register specifies the transfer of LBA address bits 0 - 7. (L=1)
Cylinder High/Low
The cylinder number of the first sector to be transferred. (L=0)
In LBA mode this register specifies the transfer of LBA address bits 8 - 15 (Low)
16 - 23 (High). (L=1)
H
The head number of the first sector to be transferred. (L=0)
In LBA mode this register specifies the transfer of LBA bits 24-27. (L=1)
Deskstar 120GXP hard disk drive specifications
128