PC87317VUL Datasheet, PDF (111/272 Pages) National Semiconductor (TI) – PC87317VUL/PC97317VUL SuperI/O Plug and Play Compatible with ACPI Compliant Controller/Extender

The Digital Floppy Disk Controller (FDC) (Logical Device 3)
Read Operations, PS/2 Drive Mode
76543210
Digital Input
1 111
1 Reset
Register (DIR)
Offset 07h
Required
High Density
DRATE0 Status
DRATE1 Status
Reserved
DSKCHG
Write Operations
7 6 5 4 3 2 1 0 _{Configuration Control}
0 0 0 0 0 0 1 0 Reset
Register (CCR)
Offset 07h
Required
DRATE0
DRATE1
Reserved
5.6.2 Result Phase Status
76543210
Result Phase Status
0 0 0 0 0 0 0 0 Reset ^{Register 0 (ST0)}
Required
Logical Drive Selected
(Execution Phase)
Head Selected (Execution Phase)
Not Used
Equipment Check
SEEK End
Interrupt Code
76543210
Result Phase Status
0 0 0 0 0 0 0 0 Reset ^{Register 1 (ST1)}
Required
Missing Address Mark
Drive Write Protected
Missing Data
Not Used
Overrun or Underrun
CRC Error
Not Used
End of Track
76543210
Result Phase Status
0 0 0 0 0 0 0 0 Reset ^{Register 2 (ST2)}
Required
Missing Address
Mark Location
Bad Track
Scan Not Satisfied
Scan Equal Hit
Wrong Track
CRC Error in Data Field
Control Mark
Not Used
76543210
Result Phase Status
0 0 0 0 0 0 0 0 Reset ^{Register 3 (ST3)}
Required
Logical Drive Selected
(Command Phase)
Head Selected (Command Phase)
Not Used
Track 0
Not Used
Drive Write Protected
Not Used
111
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