W83627F Information Storage Devices, Inc, W83627F Datasheet - Page 84

• Manufacturer Part Number: W83627F
• Description: LPC Interface I/o Plus Kbc, Game Port, Midi Port
• Manufacturer: Information Storage Devices, Inc

CR70 (Default 0x06 if PNPCVS = 0 during POR, default 0x00 otherwise)
CR74 (Default 0x02 if PNPCVS = 0 during POR, default 0x04 otherwise)
CRF0 (Default 0x0E)
FDD Mode Register
Bit 7 - 4 : Reserved.
Bit 3 - 0 : These bits select IRQ resource for FDC.
Bit 7 - 3 : Reserved.
Bit 2 - 0 : These bits select DRQ resource for FDC.
Bit 7
This bit controls the internal pull-up resistors of the FDC input pins RDATA, INDEX, TRAK0,
DSKCHG, and WP.
Bit 6
This bit determines the polarity of all FDD interface signals.
Bit 5
When this bit is a logic 0, indicates a second drive is installed and is reflected in status register A.
Bit 4
Bit 3 - 2 :Interface Mode
Bit 1
Bit 0
= 0x00 DMA0
= 0x01 DMA1
= 0x02 DMA2
= 0x03 DMA3
= 0x04 - 0x07 No DMA active
: FIPURDWN
= 0
= 1
: INTVERTZ
= 0
= 1
: DRV2EN (PS2 mode only)
: Swap Drive 0, 1 Mode
= 0
= 1
= 11
= 10
= 01
= 00
: FDC DMA Mode
= 0 Burst Mode is enabled
= 1 Non-Burst Mode (Default)
: Floppy Mode
= 0 Normal Floppy Mode (Default)
= 1 Enhanced 3-mode FDD
No Swap (Default)
Drive and Motor sel 0 and 1 are swapped.
The internal pull-up resistors of FDC are turned on.(Default)
The internal pull-up resistors of FDC are turned off.
FDD interface signals are active low.
FDD interface signals are active high.
(Reserved)
AT Mode (Default)
Model 30
PS/2
- 80 -
Publication Release Date:November 2002
W83627HF/F
Revision 2.0