F81867 Datasheet, PDF (137/315 Pages) Feature Integration Technology Inc. – 6 UARTs μSuper IO With 128 Bytes FIFO and Power Saving Functions

IRQ Channel Select Register ⎯ Index 70h
Bit
Name
R/W Reset Default
Description
7-4
Reserved
-
-
- Reserved.
3-0
SELFDCIRQ
R/W LRESET# 06h Select the IRQ channel for FDC.
DMA Channel Select Register ⎯ Index 74h
Bit
Name
R/W Reset Default
Description
7-3
Reserved
-
-
- Reserved.
2-0
SELFDCDMA R/W LRESET# 010 Select the DMA channel for FDC.
FDD Mode Register ⎯ Index F0h
Bit
Name
R/W Reset Default
Description
7-5
Reserved
-
-
- Reserved.
FDC Software Write Protect.
4
FDC_SW_WP R/W LRESET# 0 0: Write protect is determined by WPT# pin.
1: Enable Write Protect.
00: Model 30 mode.
01: PS/2 mode.
3-2
IF_MODE
R/W LRESET# 11
10: Reserved.
11: AT mode (default).
0: enable burst mode.
1
FDMAMODE
R/W LRESET# 1
1: non-busrt mode (default).
0
Reserved
R/W
-
0 Reserved.
FDD Drive Type Register ⎯ Index F2h
Bit
Name
R/W Reset Default
7-2
Reserved
-
-
- Reserved.
1-0
FDD_TYPE
R/W LRESET# 11 FDD drive type.
Description
FDD Selection Register ⎯ Index F4h
Bit
Name
R/W Reset Default
Description
7-5
Reserved
-
-
- Reserved.
Data rate table select, refer to table A.
00: select regular drives and 2.88 format.
4-3
FDD_DRT
R/W LRESET# 00 01: reserved.
10: 2 mega tape.
11: reserved.
2
Reserved
-
-
- Reserved.
1-0
FDD_DT
R/W LRESET# 00 Drive type select, refer to table B.
TABLE A
Data Rate Table Select
FDD_DRT[1]
FDD_DRT[0]
Data Rate
DATARATE1 DATARATE0
Selected Data Rate
MFM
FM
F81867
DENSEL
137
Dec, 2011
V0.12P