PC87307VUL National Semiconductor, PC87307VUL Datasheet - Page 84

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

www.national.com
5.6 FDC REGISTER BITMAPS
5.6.1
0
0
1
1
7
7
7
7
Motor Enable 3
Reserved
IRQ Pending
0
6
6
1
1
6
6
FDC Standard Register Bitmaps
Reserved
Motor Enable 2
Reserved
0
0
5
5
0
5
5
Step
Motor Enable 1
DR0
1
0
0
4
4
4
4
PC-AT Compatible Drive Mode
Not Used
TRI-STATE During Read Operations
TRK0
Motor Enable 0
WDATA
0
0
0
3
3
3
3
PS/2 Drive Mode
PS/2 Drive Mode
Head Select
DMAEN
RDATA
0
0
2
2
2
2
INDEX
Reset Controller
WGATE
0
0
0
1
1
1
1
WP
MTR1
0
0
0
0
0
0
0
0
The Digital Floppy Disk Controller (FDC) (Logical Device 3)
Tape Drive Select 1,0
Reset
Required
Reset
Required
Reset
Required
Head Direction
Reset
Required
MTR0
Drive Select
Register (TDR)
Status Register
Status Register
Register (DOR)
Digital Output
Tape Drive
Offset 03h
Offset 00h
Offset 02h
Offset 01h
A (SRA)
B (SRB)
84
0
0
7
7
7
7
Extra Density
RQM
Software Reset
0
0
6
6
6
6
High Density
Data I/O Direction
Low Power
0
0
5
5
5
5
Non-DMA Execution
Undefined
1
Drive ID1 Information
0
0
4
4
4
4
Drive ID0 Information
Command in Progress
0
0
3
3
3
3
Write Operations
Read Operations
Data
Drive 3 Busy
0
0
PS/2 Drive Mode
2
2
2
2
Precompensation Delay Select
Logical Drive Exchange
0
0
1
Drive 2 Busy
1
1
1
1
Drive 1 Busy
DRATE1
0
0
0
0
0
0
0
Tape Drive Select 1,0
Reset
Required
Reset
Required
Reset
Required
Reset
Required
Drive 0 Busy
DRATE0
Data Rate Select
Register (TDR)
Register (MSR)
Register (DSR)
Data Register
Tape Drive
Main Status
Offset 03h
Offset 04h
Offset 04h
Offset 05h
(FIFO)