IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 146

Read Long 22h/23h

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11.15 Read Long (22h/23h) Command Block Output Registers Register 76543210 Data -------- Feature -------- Sector Count 0 0 0 0 0 0 0 1 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 0010001R Command Block Input Registers Register 76543210 Data -------- Error see below Sector Count 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 000V0V0V Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 V 0 V - 0 -V 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. Whatever 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

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11.15 Read Long (22h/23h)
see below
Status
0010001R
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
-------V
Sector Count
00000001
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
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