11.15 Read Long (22h/23h)
see below
Status
0 0 1 0 0 0 1 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
Sector Count
0 0 0 0 0 0 0 1
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
0
0
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 113. Read Long Command (22h/23h)
The Read Long command reads the designated one sector of data and the ECC bytes from disk media
and then transfers the data and ECC bytes from the device to the host.
After 512 bytes of data have been transferred, the device will keep setting DRQ=1 to indicate that the
device is ready to transfer the ECC bytes to the host. The data is transferred 16 bits at a time; the ECC
bytes are transferred 8 bits at a time. The number of ECC bytes is 4 or 52 according to setting of Set
Feature option. The default setting is 4 bytes of ECC data.
The command makes a single attempt to read the data and does not check the data using ECC. What-
ever is read is returned to the host.
Output parameters to the device
Sector Count
The number of continuous sectors to be transferred. The Sector Count must be
set to one.
Sector Number
The sector number of the sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 0 - 7. (L=1)
Cylinder High/Low
The cylinder number of the sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 8 - 15 (Low), 16 - 23 (High). (L=1)
H
The head number of the sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 24-27. (L=1)
R
The retry bit. This bit is ignored.
Deskstar 120GXP hard disk drive specifications
132
Содержание IC35L040AVVN07-0 - 40GB IDE Deskstar 120GXP 7200RPM UATA-100...
Страница 2: ...This page intentionally left blank...
Страница 10: ...This page intentionally left blank...
Страница 16: ...This page intentionally left blank...
Страница 18: ...This page intentionally left blank...
Страница 19: ...Part 1 Functional specification Deskstar 120GXP hard disk drive specifications 5...
Страница 20: ...This page intentionally left blank...
Страница 22: ...This page intentionally left blank...
Страница 34: ...This page intentionally left blank...
Страница 76: ...This page intentionally left blank...
Страница 77: ...Part 2 Interface specification Deskstar 120GXP hard disk drive specifications 63...
Страница 78: ...This page intentionally left blank...
Страница 80: ...This page intentionally left blank...
Страница 206: ...This page intentionally left blank...
Страница 208: ...This page intentionally left blank...