PC87307VUL National Semiconductor, PC87307VUL Datasheet - Page 91

• Manufacturer Part Number: PC87307VUL
• Description: PC87307/PC97307 Plug and Play Compatible and PC97 Compliant SuperI/O
• Manufacturer: National Semiconductor

Drive Type and
Data Transfer
Perpendicular
250 Kbps
500 Kbps
a. Gap 2 is specified in the command phase of read, write, scan, and verify commands. Although this is the recom-
b. Gap 3 is the suggested value for use in the FORMAT TRACK command. This is the programmable Gap 3 illus-
Toshiba
Format
Format
Format
MFM
MFM
(MFM)
(MFM)
Rate
mended value, the FDC ignores this byte in read, write, scan and verify commands.
trated in Figure 5-20.
IBM
ISO
FIGURE 5-20. IBM, Perpendicular, and ISO Formats Supported by the FORMAT TRACK Command
A1* = Data Pattern of A1, Clock Pattern of 0A. All other data rates use gap 2 = 22 bytes.
C2* = Data Pattern of C2, Clock Pattern of 14
Index Pulse
Field (decimal)
Gap 0
Gap 0
Bytes in Data
80 of
80 of
4E
4E
1024
2048
4096
1024
2048
4096
8192
SYNC
SYNC
256
256
512
512
256
512
512
12 of
12 of
00
00
Address
Index
Field
3 of
C2* FC
3 of
C2* FC
IAM
IAM
Bytes-Per-Sector
Gap 1
Gap 1
Gap 1
50 of
50 of
32 of
4E
4E
4E
Code (hex)
TABLE 5-12. Typical Gap 3 Values
SYNC
SYNC
SYNC
12 of
12 of
12 of
00
00
00
01
01
02
02
03
04
05
01
02
02
03
04
05
06
3 of
A1* FE
3 of
A1* FE
3 of
A1* FE
AM
AM
AM
Address Field
T
r
a
c
k
T
r
a
c
k
T
r
a
c
k
End of Track (EOT)
91
H
e
a
d
H
e
a
d
H
e
a
d
Sector # (hex)
S
e
c
t
o
r
S
e
c
t
o
r
S
e
c
t
o
r
Repeated for each sector
#
B
y
t
e
s
#
B
y
t
e
s
#
B
y
t
e
s
12
10
08
09
04
02
01
1A
0F
12
08
04
02
01
C
R
C
C
R
C
C
R
C
Gap 2
Gap 2
Gap 2
22 of
41 of
22 of
4E
4E
4E
SYNC
SYNC
SYNC
12 of
12 of
12 of
00
00
00
Bytes in Gap 2
3 of
A1*
3 of
A1*
3 of
A1*
AM
AM
AM
FB
or
F8
FB
or
F8
FB
or
F8
(hex)
C8
C8
C8
C8
0A
20
2A
2A
80
0E
1B
1B
35
99
Data Field
Data
Data
Data
a
Bytes in Gap 3
C
R
C
C
R
C
C
R
C
Program-
Program-
Program-
Gap 3
Gap 3
Gap 3
able
able
able
(hex)
www.national.com
0C
6C
32
50
50
F0
FF
FF
36
54
74
FF
FF
FF
Gap 4
Gap 4
Gap 4
b