Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
READ ID
DATA BUS
PHASE
R/W D7
D6
MFM
0
D5 D4 D3
D2
D1
D0
REMARKS
Commands
Command
W
W
0
0
0
0
0
0
1
0
0
1
0
HDS DS1 DS0
Execution
The first correct ID
information on the
Cylinder is stored in
Data Register
Result
R
ST0
Status information after
Command execution.
Disk status after the
Command has
completed
R
R
R
R
R
R
ST1
ST2
C
H
R
N
PERPENDICULAR MODE
DATA BUS
PHASE
R/W
D7
0
D6 D5 D4 D3 D2
D1
1
D0
REMARKS
Command
W
0
0
0
1
0
0
0
Command Codes
OW
D3 D2 D1 D0
GAP
WGATE
INVALID CODES
DATA BUS
PHASE
R/W D7 D6 D5 D4 D3 D2 D1 D0
REMARKS
Command
W
Invalid Codes
Invalid Command Codes
(NoOp – FDC goes into
Standby State)
Result
R
ST0
ST0 = 80H
LOCK
DATA BUS
PHASE
Command
Result
R/W
W
D7
LOCK
0
D6 D5
D4
1
D3 D2 D1 D0
REMARKS
0
0
0
0
0
0
1
0
0
0
0
0
Command Codes
R
LOCK
SC is returned if the last command that was issued was the Format command. EOT is returned if the last command
was a Read or Write.
Note: These bits are used internally only. They are not reflected in the Drive Select pins. It is the user’s
responsibility to maintain correspondence between these bits and the Drive Select pins (DOR).
Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)
64
SMSC LPC47M182
DATASHEET
SMSC [ SMSC CORPORATION ]
