Hitachi HTS541680J9SA00 Specifications - Page 105

Read Long 22h/23h

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Travelstar 5K160 (SATA) Hard Disk Drive Specification 14.17 Read Long (22h/23h) Command Block Output Registers Register 76543210 Data -------- Feature -------- Sector Count 00000001 LBA Low VVVVVVVV LBA Mid VVVVVVVV LBA High VVVVVVVV Device - L - - HHHH Command 0 0 1 0 0 0 1R Command Block Input Registers Register 76543210 Data -------- Error ...See Below... Sector Count V LBA Low VVVVVVVV LBA Mid VVVVVVVV LBA High VVVVVVVV Device - - - - HHHH Status ...See Below... Error Register 7 6 5 4 3 2 1 0 CRC UNC 0 IDN 0 ABT T0N AM N 000V0V0 0 Figure 61 Read Long Command (22h/23h) Status Register 7 6543 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0V0V - 0 0V The Read Long command reads the designated one sector of data and the ECC bytes from the disk media, 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 number of ECC bytes are 4 or 52 according to the 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. LBA Low The sector number of the sector to be transferred. (L=0) In LBA mode, this register contains LBA bits 0 - 7. (L=1) LBA High/Mid The cylinder number of the sector to be transferred. (L=0) In LBA mode, this register contains 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 LBA bits 24-27. (L=1) R The retry bit , but this bit is ignored. Input Parameters From The Device Sector Count The number of requested sectors not transferred. LBA Low The sector number of the transferred sector. (L=0) In LBA mode, this register contains current LBA bits 0 - 7. (L=1) LBA High/Mid The cylinder number of the transferred sector. (L=0) In LBA mode, this register contains current LBA bits 8 - 15 (Mid), 16 - 23 (High). (L=1) H The head number of the transferred sector. (L=0) In LBA mode, this register contains current LBA bits 24-27. (L=1) It should be noted that the device internally uses 52 bytes of ECC data on all data written or read from the disk. The 4 byte mode of operation is provided via an emulation. It is recommended that for testing the effectiveness and integrity of the devices ECC functions that the 52 byte ECC mode should be used. 105/167

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Travelstar 5K160 (SATA) Hard Disk Drive Specification
105/167
14.17
Read Long (22h/23h)
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
0 0 0 0
0
0
0
1
Sector Count
-
-
-
-
-
-
-
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
-
-
HHHH
Device
-
-
-
- H H H H
Command
0 0 1 0
0
0
1
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
AM
N
BSY
RDY
DF
DSC
DRQ COR
IDX
ERR
0
0
0
V
0
V
0
0
0
V
0
V
-
0
0
V
Figure 61 Read Long Command (22h/23h)
The Read Long command reads the designated one sector of data and the ECC bytes from the disk
media, 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 number of ECC bytes are 4 or 52
according to the 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.
LBA Low
The sector number of the sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 0 - 7. (L=1)
LBA
High/Mid
The cylinder number of the sector to be transferred. (L=0)
In LBA mode, this register contains 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 LBA bits 24-27. (L=1)
R
The retry bit , but this bit is ignored.
Input Parameters From The Device
Sector Count
The number of requested sectors not transferred.
LBA Low
The sector number of the transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 0 - 7. (L=1)
LBA
High/Mid
The cylinder number of the transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 8 - 15 (Mid), 16 - 23 (High).
(L=1)
H
The head number of the transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 24-27. (L=1)
It should be noted that the device internally uses 52 bytes of ECC data on all data written or read
from the disk. The 4 byte mode of operation is provided via an emulation. It is recommended that for
testing the effectiveness and integrity of the devices ECC functions that the 52 byte ECC mode
should be used.