LPC47M112 SMSC Corporation, LPC47M112 Datasheet - Page 57

• 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
EOT value equal to the final sector to be checked. If EC is set to "0", DTL/SC should be programmed to 0FFH. Refer to
Table 22 and Table 23 for information concerning the values of MT and EC versus SC and EOT value.
Definitions:
# Sectors Per Side = Number of formatted sectors per each side of the disk.
# Sectors Remaining = Number of formatted sectors left which can be read, including side 1 of the disk if MT is set to
"1".
Note:
0, verifying will continue on Side 1 of the disk.
Format A Track
The Format command allows an entire track to be formatted. After a pulse from the nINDEX pin is detected, the FDC
starts writing data on the disk including gaps, address marks, ID fields, and data fields per the IBM System 34 or 3740
format (MFM or FM respectively). The particular values that will be written to the gap and data field are controlled by the
values programmed into N, SC, GPL, and D which are specified by the host during the command phase. The data field
of the sector is filled with the data byte specified by D. The ID field for each sector is supplied by the host; that is, four
data bytes per sector are needed by the FDC for C, H, R, and N (cylinder, head, sector number and sector size
respectively).
After formatting each sector, the host must send new values for C, H, R and N to the FDC for the next sector on the
track. The R value (sector number) is the only value that must be changed by the host after each sector is formatted.
This allows the disk to be formatted with nonsequential sector addresses (interleaving).
formatting continues for the whole track until the FDC encounters a pulse on the nINDEX pin again and it terminates the
command.
Table 24 contains typical values for gap fields which are dependent upon the size of the sector and the number of
sectors on each track. Actual values can vary due to drive electronics.
SMSC DS – LPC47M112
MT
0
0
0
0
1
1
1
1
If MT is set to "1" and the SC value is greater than the number of remaining formatted sectors on Side
GAP4a
80x
4E
SYNC
12x
00
EC
0
0
1
1
0
0
1
1
C2
3x
IAM
FC
SC = DTL
EOT ≤ # Sectors Per Side
SC = DTL
EOT > # Sectors Per Side
SC ≤ # Sectors Remaining AND
EOT ≤ # Sectors Per Side
SC > # Sectors Remaining OR
EOT > # Sectors Per Side
SC = DTL
EOT ≤ # Sectors Per Side
SC = DTL
EOT > # Sectors Per Side
SC ≤ # Sectors Remaining AND
EOT ≤ # Sectors Per Side
SC > # Sectors Remaining OR
EOT > # Sectors Per Side
GAP1
50x
4E
Table 23 - Verify Command Result Phase
SYSTEM 34 (DOUBLE DENSITY) FORMAT
SYNC
12x
00
SC/EOT VALUE
A1
3x
IDAM
DATASHEET
FE
FORMAT FIELDS
C
Y
L
H
D
Page 57
S
E
C
N
O
C
R
C
GAP2
22x
4E
Success Termination
Result Phase Valid
Unsuccessful Termination
Result Phase Invalid
Successful Termination
Result Phase Valid
Unsuccessful Termination
Result Phase Invalid
Successful Termination
Result Phase Valid
Unsuccessful Termination
Result Phase Invalid
Successful Termination
Result Phase Valid
Unsuccessful Termination
Result Phase Invalid
SYNC
12x
00
TERMINATION RESULT
A1
3x
DATA
AM
FB
F8
DATA
C
R
C
This incrementing and
GAP3 GAP 4b
Rev. 02/02/2005