FDC37B78X SMSC Corporation, FDC37B78X Datasheet - Page 62

• Manufacturer Part Number: FDC37B78X
• Description: Enhanced Super I/O Controller with ACPI Support/ Real Time Clock and Consumer IR
• Manufacturer: SMSC Corporation

nonsequential sector addresses (interleaving).
This incrementing and formatting continues for
the whole track until the FDC encounters a pulse
on the IDX pin again and it terminates the
command.
GAP4a
GAP4a
GAP4a
80x
40x
80x
4E
FF
4E
SYNC
SYNC
SYNC
12x
12x
00
00
00
6x
C2
C2
3x
3x
IAM
IAM
IAM
FC
FC
FC
GAP1
GAP1
GAP1
50x
26x
50x
4E
FF
4E
SYSTEM 3740 (SINGLE DENSITY) FORMAT
SYSTEM 34 (DOUBLE DENSITY) FORMAT
SYNC
SYNC
SYNC
12x
12x
00
00
00
6x
A1
A1
3x
PERPENDICULAR FORMAT
3x
IDAM
IDAM
IDAM
FE
FE
FE
FORMAT FIELDS
C
Y
C
Y
C
Y
L
L
L
H
D
H
D
H
D
62
C
C
C
S
E
S
E
S
E
N
O
N
O
N
O
TABLE 29 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.
C
R
C
C
R
C
C
R
C
GAP2
GAP2
GAP2
22x
11x
41x
4E
FF
4E
SYNC
SYNC
SYNC
12x
12x
00
00
00
6x
A1
A1
3x
3x
DATA
DATA
DATA
FB or
AM
AM
AM
F8
FB
FB
F8
F8
DATA
DATA
DATA
C
R
C
C
R
C
C
R
C
GAP3 GAP 4b
GAP3 GAP 4b
GAP3 GAP 4b