pc87307 National Semiconductor Corporation, pc87307 Datasheet - Page 85

• Manufacturer Part Number: pc87307
• Description: Plug And Play Compatible And Pc97 Compliant Superi/o
• Manufacturer: National Semiconductor Corporation

0
7
7
7
DSKCHG
DSKCHG
1
1
0
6
6
6
1
1
0
5
5
5
Read Operations, PC-AT Drive Mode
Read Operations, PS/2 Drive Mode
1
1
0
4
4
4
Reserved
Reserved
1
1
0
3
3
3
Write Operations
0
2
2
2
Reserved, In TRI-STATE
DRATE1 Status
1
1
1
1
DRATE0 Status
DRATE1
1
1
0
0
0
0
The Digital Floppy Disk Controller (FDC) (Logical Device 3)
Reset
Required
Reset
Required
Reset
Required
DRATE0
High Density
Configuration Control
Register (CCR)
Register (DIR)
Register (DIR)
Digital Input
Digital Input
Offset 07h
Offset 07h
Offset 07h
85
5.6.2
0
7
0
0
0
7
7
7
0
6
0
0
0
6
End of Track
6
Not Used
6
Not Used
FDC Result Phase Status Register Bitmaps
Interrupt Code
Not Used
Control Mark
Drive Write Protected
0
5
0
0
0
5
5
5
SEEK End
CRC Error
CRC Error in Data Field
Not Used
0
4
0
0
0
4
4
4
Equipment Check
0
Overrun or Underrun
Wrong Track
Track 0
3
0
0
0
3
3
3
Not Used
Not Used
Scan Equal Hit
Not Used
0
2
0
0
0
2
2
2
Head Selected (Execution Phase)
Head Selected (Command Phase)
0
1
0
0
0
Missing Data
Scan Not Satisfied
1
1
1
0
0
0
0
0
Drive Write Protected
Bad Track
0
0
0
Reset
Required
Reset
Required
Reset
Required
Reset
Required
Missing Address Mark
Missing Address
Mark Location
Logical Drive Selected
(Execution Phase)
(Command Phase)
Logical Drive Selected
Result Phase Status
Result Phase Status
Result Phase Status
Result Phase Status
Register 0 (ST0)
Register 1 (ST1)
Register 2 (ST2)
Register 3 (ST3)
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