w83627ef Winbond Electronics Corp America, w83627ef Datasheet - Page 105

• Manufacturer Part Number: w83627ef
• Description: Lpc Super I/o For Desktop & Server
• Manufacturer: Winbond Electronics Corp America

CR 74h. (Default 02h)
CR F0h. (Default 8Eh)
CR F1h. (Default 00h)
7~3
2~0
3~2
7~6
5~4
3~2
BIT
BIT
BIT
7
6
5
4
1
0
Reserved.
READ / WRITE
READ / WRITE
READ / WRITE
R / W
R / W
R / W
R / W
R / W
R / W
R / W
R / W
R / W
R / W
R / W
These bits select DRQ resource for FDC.
000: DMA0.
1xx: No DMA active.
This bit controls the internal pull-up resistors of the FDC input pins
RDATA#, INDEX#, TRAK0#, DSKCHG# and WP#.
0: The internal pull-up resistors of FDC are turned on.
1: The internal pull-up resistors of FDC are turned off. (Default)
This bit determines the polarity of all FDD interface signals.
0: FDD interface signals are active low.
1: FDD interface signals are active high.
When this bit is logic 0, indicates a second drive is installed and is
reflected in status register A. (PS2 mode only)
Swap Drive 0, 1 Mode =>
0: No Swap.
Interface Mode.
FDC DMA Mode.
Floppy Mode.
Boot Floppy.
Media ID1, Media ID0. These bits will be reflected on FDC’s Tape Drive
Register bit 7, 6.
Density Select.
00: Normal.
10: 1 (Forced to logic 1).
W83627EHF/EF, W83627EHG/EG
001: DMA1.
- 99 -
1: Drive and Motor select 0 and 1 are swapped.
00: Model 30.
10: Reserved.
0: Burst Mode is enabled
1: Non-Burst Mode.
0: Normal Floppy Mode.
1: Enhanced 3-mode FDD.
00: FDD A.
10: FDD C.
DESCRIPTION
DESCRIPTION
DESCRIPTION
010: DMA2.
01 Normal.
11: 0 (Forced to logic 0).
Publication Release Date: Nov. 2006
011: DMA3.
01: PS/2.
11: AT Mode
01: FDD B.
11: FDD D.
Revision 1.3