LPC47M112 SMSC Corporation, LPC47M112 Datasheet - Page 58

• Manufacturer Part Number: LPC47M112
• Description: ENHANCED SUPER I/O CONTROLLER WITH LPC INTERFACE
• Manufacturer: SMSC Corporation

Enhanced Super I/O Controller with LPC Interface
Datasheet
CONTROL COMMANDS
Control commands differ from the other commands in that no data transfer takes place. Three commands generate an
interrupt when complete: Read ID, Recalibrate, and Seek. The other control commands do not generate an interrupt.
Read ID
The Read ID command is used to find the present position of the recording heads. The FDC stores the values from the
first ID field it is able to read into its registers. If the FDC does not find an ID address mark on the diskette after the
second occurrence of a pulse on the nINDEX pin, it then sets the IC code in Status Register 0 to "01" (abnormal
termination), sets the MA bit in Status Register 1 to "1", and terminates the command.
The following commands will generate an interrupt upon completion. They do not return any result bytes. It is highly
recommended that control commands be followed by the Sense Interrupt Status command. Otherwise, valuable
interrupt status information will be lost.
Recalibrate
SMSC DS – LPC47M112
GAP4a
GAP4a
40x
80x
FF
4E
GPL1 = suggested GPL values in Read and Write commands to avoid splice point
between data field and ID field of contiguous sections.
GPL2 = suggested GPL value in Format A Track command.
*PC/AT values (typical)
**PS/2 values (typical). Applies with 1.0 MB and 2.0 MB drives.
NOTE: All values except sector size are in hex.
SYNC
SYNC
Drives
Drives
5.25"
12x
3.5"
6x
00
00
C2
3x
IAM
IAM
FC
FC
FORMAT
MFM
MFM
FM
FM
GAP1
GAP1
26x
50x
FF
4E
SYSTEM 3740 (SINGLE DENSITY) FORMAT
SYNC
SYNC
Table 24 - Typical Values for Formatting
12x
00
00
6x
SECTOR SIZE
A1
3x
512**
IDAM
PERPENDICULAR FORMAT
IDAM
1024
2048
4096
1024
2048
4096
1024
512*
128
128
512
256
256
128
256
512
256
DATASHEET
FE
...
...
FE
C
C
Y
L
Y
L
H
D
H
D
Page 58
S
E
C
S
E
C
N
O
N
O
00
00
02
03
04
05
01
01
02
03
04
05
N
...
...
0
1
2
1
2
3
C
R
C
C
R
C
GAP2
GAP2
11x
41x
FF
4E
SC
0F
0F
12
10
08
04
02
01
12
10
09
04
02
01
09
05
09
05
SYNC
SYNC
12x
6x
00
00
A1
3x
DATA
DATA
FB or
AM
AM
F8
FB
GPL1
F8
C8
C8
0A
2A
C8
C8
1B
0E
1B
07
10
18
46
20
80
07
0F
35
DATA
DATA
C
R
C
C
R
C
GPL2
GAP3 GAP 4b
GAP3 GAP 4b
FF
FF
0C
FF
FF
09
19
30
87
32
50
F0
1B
2A
3A
36
54
74
Rev. 02/02/2005