ATA Bus Interface and ATA Commands
Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT
6-33
6.7.5
6.7.5
6.7.5
6.7.5
Seek
Seek
Seek
Seek
COMMAND CODE – 70h
DESCRIPTION – The SEEK command causes the actuator to seek to the LBA or
Cylinder location indicated in the LBA Registers or Cylinder Registers.
When the drive receives this command in its Command Block Registers, it performs
the following functions:
1. Sets BSY
2. Initiates the seek operation
3. Resets BSY
4. Sets the Drive Seek Complete (DSC) bit in the Status Register
The drive does not wait for the seek to complete before it sends an interrupt. If the
BSY bit is
not
set in the Status Register, the drive can accept and queue subsequent
commands while performing the seek. If the Cylinder registers contain an illegal
cylinder, the drive sets the ERR bit in the Status Register and the IDNF bit in the
Error Register.
INPUTS
OUTPUTS
Register
Register
Register
Register
7
77
7
6
66
6
5
55
5
4
44
4
3
33
3
2
22
2
1
11
1
0
00
0
Features
na
Sector Count
Sector count
Sector Number
Sector Number or LBA
Cylinder Low
Cylinder low or LBA
Cylinder High
Cylinder high or LBA
Device/ Head
obs
LBA
obs
DEV
na
Head Number or LBA
Command
70h
Register
Register
Register
Register
7
77
7
6
66
6
5
55
5
4
44
4
3
33
3
2
22
2
1
11
1
0
00
0
Error
na
UNC
na
IDNF
na
ABRT
na
obs
Sector Count
na
Sector Number
Sector Number or LBA
Cylinder Low
Cylinder low or LBA
Cylinder High
Cylinder high or LBA
Device/ Head
obs
Na
obs
DEV
HEAD number or LBA
Status
BSY
DRDY
DF
DSC
DRQ
na
na
ERR
Summary of Contents for FIREBALL PLUS AS 10.2
Page 12: ...About This Manual 1 4 Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT ...
Page 16: ...General Description 2 8 Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT ...
Page 61: ...Basic Principles of Operation Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT 5 16 ...
Page 62: ...Basic Principles of Operation 5 17 Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT ...
Page 162: ...Index I 4 Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT ...