W83697HF/F
CRF0 (Default 0x0E)
FDD Mode Register
Bit 7
: FIPURDWN
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.(Default)
= 1 The internal pull-up resistors of FDC are turned off.
: INTVERTZ
Bit 6
This bit determines the polarity of all FDD interface signals.
= 0 FDD interface signals are active low.
= 1 FDD interface signals are active high.
: DRV2EN (PS2 mode only)
Bit 5
Bit 4
When this bit is a logic 0, indicates a second drive is installed and is reflected in status
register A.
: Swap Drive 0, 1 Mode
= 0 No Swap (Default)
= 1 Drive and Motor select 0 and 1 are swapped.
Bit 3 - 2 Interface Mode
= 11 AT Mode (Default)
= 10 (Reserved)
= 01 PS/2
= 00 Model 30
Bit 1
Bit 0
: FDC DMA Mode
= 11 Burst Mode is enabled
= 10 Non-Burst Mode (Default)
: Floppy Mode
= 11 Normal Floppy Mode (Default)
= 10 Enhanced 3-mode FDD
CRF1 (Default 0x00)
Bit 7 - 6 : Boot Floppy
= 00 FDD A
= 01 FDD B
= 10 FDD C
= 11 FDD D
Bit 5, 4 : Media ID1, Media ID0. These bits will be reflected on FDC's Tape Drive Register bit 7, 6.
Publication Release Date: Feb. 2002
- 141 -
Revision 0.70
WINBOND [ WINBOND ]
