W83L517D Datasheet, PDF (121/138 Pages) Winbond – LPC SUPER I/O

Bit 4: Swap Drive 0, 1 Mode
= 0 No Swap (Default)
= 1 Drive and Motor select 0 and 1 are swapped.
Bit 3 - 2 Interface Mode
= 11b AT Mode (Default)
= 10b (Reserved)
= 01b PS/2
= 00b Model 30
Bit 1: FDC DMA Mode
= 0 Burst Mode is enabled
= 1 Non-Burst Mode (Default)
Bit 0: Floppy Mode
= 0 Normal Floppy Mode (Default)
= 1 Enhanced 3-mode FDD
W83L517D
Version 0.6
CRF1 (Default 0x00h)
Bit 7 - 6: Boot Floppy
= 00b FDD A
= 01b FDD B
= 10b FDD C
= 11b FDD D
Bit 5, 4: Media ID1, Media ID0. These bits will be reflected on FDC's Tape Drive Register bit 7, 6.
Bit 3 - 2: Density Select
= 00b Normal (Default)
= 01b Normal
= 10b 1 ( Forced to logic 1)
= 11b 0 ( Forced to logic 0)
Bit 1: DISFDDWR
= 0 Enable FDD write.
= 1 Disable FDD write(forces pins WE, WD stay high).
Bit 0: SWWP
= 0 Normal, use WP to determine whether the FDD is write protected or not.
= 1 FDD is always write-protected.
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Publication Release Date: Apr. 2000
Revision 0.60