W83627HF/F
PRELIMINARY
Publication Release Date: November 2000
- 24 - Revision 1.0
FDCs with perpendicular recording drives can read standard 3.5" floppy disks and can read and write
perpendicular media. Some manufacturers offer drives that can read and write standard and
perpendicular media in a perpendicular media drive.
A single command puts the FDC into perpendicular mode. All other commands operate as they normally
do. The perpendicular mode requires a 1 Mbps data rate for the FDC. At this data rate the FIFO eases
the host interface bottleneck due to the speed of data transfer to or from the disk.
3.1.6 FDC Core
The W83627HF FDC is capable of performing twenty commands. Each command is initiated by a multi-
byte transfer from the microprocessor. The result can also be a multi-byte transfer back to the
microprocessor. Each command consists of three phases: command, execution, and result.
Command
The microprocessor issues all required information to the controller to perform a specific operation.
Execution
The controller performs the specified operation.
Result
After the operation is completed, status information and other housekeeping information is provided to
the microprocessor.
3.1.7 FDC Commands
Command Symbol Descriptions:
C:
Cylinder number 0 - 256
D:
Data Pattern
DIR:
Step Direction
DIR = 0, step out
DIR = 1, step in
DS0:
Disk Drive Select 0
DS1:
Disk Drive Select 1
DTL:
Data Length
EC:
Enable Count
EOT:
End of Track
EFIFO:
Enable FIFO
EIS:
Enable Implied Seek
EOT:
End of track
FIFOTHR:
FIFO Threshold
GAP:
Gap length selection
GPL:
Gap Length
Содержание W83627F
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Страница 99: ...W83627HF F PRELIMINARY Publication Release Date November 2000 90 Revision 1 0 Figure 8 1 ...
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Страница 114: ... 0 1 1 2 3 1 2 3 D D D DD D DD D 0 0 4 3 9 7 3 4 0 0 4 3 9 7 3 4 9 9 9 0 0 4 3 A 9 3 4 0 0 4 3 B 9 43 3 3 4 A 9 C C ...
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Страница 117: ... A 9 H 1 6 1 H 1 F 1 E E F 1 E E E E E G ...
Страница 118: ... 4 7 28 5 6 19 H 6 1 H 1 H 1 1 H H 1 6 1 H 1 F 1 E E E F 1 E E E E E ...
Страница 119: ... B A B B 7 28 6 4 6ID J B A H B A 1 4 6ID J B A H B A 1 H B A B A 1 B A 1 H 1 B A 1 F 1 E E E 0 E 3 H 3 ...
Страница 120: ... 2 1 4 0 HD 0 B 4 6 4 6 M 4 6 1 4 8 8 1 4 1 C 1 4 8 5 HD 4 1 H HD 4 4 9 6 2 4 4 D ...
Страница 122: ... 1 1 8 1 2 0 B 0 6 O P 4 O P 8 4 6 9 9 H H B 6 9 B 6 9 9 H H 6 4 D 9D 6 4 D 9D 6 4 D 9D0 ...
Страница 123: ... 2 1 0 H 0 B 6 M 4 9 0 6 6 2 1 6 8 0 B 6 M 4 1 H 4 M 4 6 4 D 6 1 4 6 1 4 A 6 1 4 6 1 4 A 4 M 0 M R CC ...
Страница 124: ... 2 5 1 6 8 0 B 6 M 4 H 4 H 4 D B H 4 B H 4 8 FDB H 4 8 F B H 4 8 B 6 4 H 4 8 B 6 H ...
Страница 125: ... 2 4 5 1 6 8 0 B 6 M 4 9 6 1 4 D B H 4 4 H 4 8 9DB H 4 8 9 B H 4 8 F B H 2 5 6 1 6 8 0 B 6 M 4 9 ...
Страница 126: ... 2 2 5 6 1 6 8 0 B 6 M 4 9 6 1 4 D9 2 1 1 4 2 1 6 8 0 B 6 M 4 1 1 4 9 6 1 ...
Страница 127: ... 2 1 2 6 8 0 B O P O P B 0O P 6 M 4 9 4 D9 4 9 B 0 O P 4 6ID0 J 1 2 5 1 6 8 0 B 4 0 M 0 4 6 9 6 1 4 9 6 9 4 O P ...
Страница 130: ... 2 5 1 6 8 0 B 6 M 0 0 4 4 9 4 HHH HHH 4 4 9 4 HHH HHH 2 4 1 6 8 4 0 B 6 M 45 0 4 45 0 4 0 4 0 4 ...
Страница 136: ... 2 4 6 8 D 0 B 6 M 6 4 0 6 2 1 1 4 6 8 D 0 B O P O P O P 6 M 0 4 0 4 0 4 4 4 4 D 4 4 9 6 1 ...
Страница 137: ... 2 4 7 C 4 6 8 D 1 6 M 8 9 4 0 L 0 L 2 7 C 4 6 8 D4 1 6 M 8 9 4 0 L 0 L ...
Страница 139: ... 2 1 4 6 8 D0 0 B 6 M 0 0 0 0 4 1 4 4 1 4 4 D 1 4 4 6 1 4 4 4 4 1 1 1 1 4 4 4 0 1 4 4 4 0 1 ...
Страница 140: ... 2 1 1 4D 2 1 1 4 2 5 8 1 4 6 8 D 6 M 1 2 3 4 O P 2 5 1 4 6 8 D 6 M 1 3 4 O P 4 9 6 1 ...
Страница 142: ... 2 4 5 8 1 4 6 8 D 0 B 6 M 6 0 1 3 4 4 4 9 6 1 2 5 8 1 44 6 8 DD 0 B D 6 M 1 2 3 4 9 1 9 9 4 ...
Страница 143: ... 2 2 5 1 4 6 8 D 0 B 6 M 1 3 4 1 9 4 4 9 6 1 2 5 8 1 4 6 8 D 6 M 4 9 O P ...
Страница 144: ... 2 5 1 4 6 8 D 6 M 4 O P 4 9 6 1 2 5 1 4 6 8 D 0 B 6 M 4 9D 6 9 6 1 4 9 6 9 B A 1 4 6 9 6 1 4 6 9 B A 4 6 9 ...
Страница 145: ... 2 5 8 8 1 4 6 8 D 0 B 4 6 M 6 0 1 2 3 4 9 9 4 D 2 5 8 1 4 6 8 D 0 B 6 M 6 0 1 3 4 4 4 9 6 1 ...
Страница 146: ... 2 5 8 1 44 6 8 DD 0 B D 6 M 1 2 3 4 9 1 9 9 4 2 5 1 4 6 8 D 0 B 6 M 1 3 4 1 9 4 4 9 6 1 ...
Страница 147: ... 2 4 5 1 4 0F 6 8 D 0 B 6 M 0 4 9 6 1 4 8 B4 H 4 8 DB 4 H 2 5 6 1 4 0F 6 8 D 0 B 6 M 0 4 9 6 1 4 4 2 2 1 1 4 ...
Страница 149: ... 2 4 5 1 44 6 8 DD 0 B 6 M 0 1 2 3 4 9 1 1 2 4 5 1 4 6 8 D 0 B 6 M 0 1 2 3 4 9 1 1 2 4 1 1 42 4 ...