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PC87311AVF Datasheet(PDF) 31 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87311AVF
Description  PC87311A/PC87312 (SuperI/OTM II/III) Floppy Disk Controller with Dual UARTs, Parallel Port, and IDE Interface
PDF  78 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87311AVF Datasheet(HTML) 31 Page - National Semiconductor (TI)

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40 FDC Command Set Description (Continued)
TABLE 4-1 Typical Format Gap Length Values
Mode
Sector
Sector
EOT
Sector
Format
Size
Code
Gap
GAP3
Decimal
Hex
Hex
Hex
Hex
125 kbs
128
00
12
07
09
FM
128
00
10
10
19
256
01
08
18
30
512
02
04
46
87
1024
03
02
C8
FF
2048
04
01
C8
FF
250 kbs
256
01
12
0A
0C
MFM
256
01
10
20
32
512
02
08
2A
50
512
02
09
2A
50
1024
03
04
80
F0
2048
04
02
C8
FF
4096
05
01
C8
FF
250 kbs
128
00
1A
07
1B
FM
256
01
0F
0E
2A
512
02
08
1B
3A
1024
03
04
47
8A
2048
04
02
C8
FF
4096
05
01
C8
FF
500 kbs
256
01
1A
0E
36
MFM
512
02
0F
1B
54
512
02
12
1B
6C
1024
03
08
35
74
2048
04
04
99
FF
4096
05
02
C8
FF
8192
06
01
C8
FF
Note
FM mode is not guaranteed through functional testing
Typical Values for PC Compatible Diskette Media
Media
Sector
Sector
EOT
Sector
Format
Type
Size
Code
Gap
GAP3
Decimal
Hex
Hex
Hex
Hex
360k
512
02
09
2A
50
12M
512
02
0F
1B
54
720k
512
02
09
1B
50
144M
512
02
12
1B
6C
288M
512
02
24
1B
53
Note 1
Sector Gap refers to the Intersector Gap Length parameter specified in the Command Phase of the Read Write Scan and Verify commands Although this
is the recommended value the FDC treats this byte as a don’t care in the Read Write Scan and Verify commands
Note 2
Format Gap is the suggested value to use in the Format Gap parameter of the Format command This is the programmable GAP3 as shown in
Figure 4-1
Note 3
The 288M diskette media is a Barium Ferrite media intended for use in Perpendicular Recording drives at the data rate of up to 1 Mbs
31



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