IBM DTCA-24090 Hard Drive Specifications - Page 145

for seek. L=1

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12.25 Seek (7xh) Command Block Output Registers Register 76543210 Data Feature Sector Count 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 1L1DHHHH Command 0111 Command Block Input Registers Register 76543210 Data Error ...See Below... Sector Count 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 HHHH Status ...See Below... Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 000V0V00 Status Register 76543210 BSY RDY DF DSC DRQ COR IDX ERR 0V0V 0 V Figure 89. Seek Command (7xh) The Seek command initiates a seek to the designated track and selects the designated head. The device need not be formatted for a seek to execute properly. Output Parameters To The Device Sector Number In LBA mode, this register specifies LBA address bits 0 - 7 for seek. ( L = 1 ) Cylinder High/Low The cylinder number of the seek. In LBA mode, this register specifies LBA address bits 8 - 15 (Low), 16 - 23 (High) for seek. ( L = 1 ) H The head number of the seek. In LBA mode, this register specifies LBA address bits 24 - 27 for seek. ( L = 1 ) Input Parameters From The Device Sector Number In LBA mode, this register contains current LBA bits 0 - 7. ( L = 1 ) Cylinder High/Low In LBA mode, this register contains current LBA bits 8 - 15 (Low), 16 - 23 (High). (L=1) H In LBA mode, this register contains current LBA bits 24 - 27. ( L = 1 ) Command Descriptions 137

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12.25
Seek
(7xh)
Command Block Output Registers
Command Block Input Registers
Register
76543210
Register
76543210
Data
Data
Feature
Error
...See Below...
Sector Count
Sector Count
Sector Number
VVVVVVVV
Sector Number
VVVVVVVV
Cylinder Low
VVVVVVVV
Cylinder Low
VVVVVVVV
Cylinder High
VVVVVVVV
Cylinder High
VVVVVVVV
Device/Head
1L1DHHHH
Device/Head
HHHH
Command
0111
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 AMN
BSY RDY DF
DSC DRQ COR IDX ERR
0
0
0
V
0
V
0
0
0
V
0
V
0
V
Figure 89. Seek Command (7xh)
The Seek command initiates a seek to the designated track and selects the designated head.
The device need
not be formatted for a seek to execute properly.
Output Parameters To The Device
Sector Number
In LBA mode, this register specifies LBA address bits 0 - 7 for seek. (L=1)
Cylinder High/Low
The cylinder number of the seek.
In LBA mode, this register specifies LBA address bits 8 - 15 (Low), 16 - 23 (High)
for seek. (L=1)
H
The head number of the seek.
In LBA mode, this register specifies LBA address bits 24 - 27 for seek. (L=1)
Input Parameters From The Device
Sector Number
In LBA mode, this register contains current LBA bits
0 - 7. (L=1)
Cylinder High/Low
In LBA mode, this register contains current LBA bits
8 - 15 (Low), 16 - 23 (High).
(L=1)
H
In LBA mode, this register contains current LBA bits
24 - 27. (L=1)
Command Descriptions
137