w83977atg Winbond Electronics Corp America, w83977atg Datasheet - Page 145

• Manufacturer Part Number: w83977atg
• Description: W83877tf Plus Kbc, Gp I/o, Wake-up, Fir, Cir, Pb-free
• Manufacturer: Winbond Electronics Corp America

CRF1 (Default 0x00)
Bit 6
Bit 5
Bit 4
Bit 3 - 2
Bit 1
Bit 0
Bit 7 - 6
Bit 5, 4
Bit 3 - 2
: INTVERTZ
This bit determines the polarity of all FDD interface signals.
= 0
= 1
: DRV2EN (PS2 mode only)
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
= 1
: Interface Mode
= 11
= 10
= 01
= 00
: FDC DMA Mode
= 0
= 1
: Floppy Mode
= 0
= 1
: Boot Floppy
= 00
= 01
= 10
= 11
: Media ID1, Media ID0. These bits will be reflected on FDC's Tape Drive Register bit
7, 6.
: Density Select
= 00
= 01
= 10
= 11
FDD interface signals are active low.
FDD interface signals are active high.
No Swap (Default)
Drive and Motor sel 0 and 1 are swapped.
AT Mode (Default)
(Reserved)
PS/2
Model 30
Burst Mode is enabled
Non-Burst Mode (Default)
Normal Floppy Mode (Default)
Enhanced 3-mode FDD
FDD A
FDD B
FDD C
FDD D
Normal (Default)
Normal
1 ( Forced to logic 1)
0 ( Forced to logic 0)
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W83977ATF/W83977ATG
Publication Release Date: May 2006
Revision 0.6