w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 134

• Manufacturer Part Number: w83977atf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

Bit 3: DSFDLGRQ
CR28 (Default 0x00)
CR2A (Default 0x00)
Bit 2: DSPRLGRQ
Bit 1: DSUALGRQ
Bit 0: DSUBLGRQ
Bit 7 - 5: Reserved.
Bit 4: IRQ Sharing selection.
Bit 3:Reserved
Bit 2 - 0: PRTMODS2 - PRTMODS0
Bit 7: PIN57S
Bit 5 - 4: PIN40S1, PIN40S0
Bit 6: PIN56S
= 0 Enable FDC legacy mode on IRQ and DRQ selection, then DO register bit 3 is effective
= 1 Disable FDC legacy mode on IRQ and DRQ selection, then DO register bit 3 is not
= 0 Enable PRT legacy mode on IRQ and DRQ selection, then DCR bit 4 is effective on
= 1 Disable PRT legacy mode on IRQ and DRQ selection, then DCR bit 4 is not effective
= 0 Enable UART A legacy mode IRQ selecting, then MCR bit 3 is effective on selecting
= 1 Disable UART A legacy mode IRQ selecting, then MCR bit 3 is not effective on
= 0 Enable UART B legacy mode IRQ selecting, then MCR bit 3 is effective on selecting
= 1 Disable UART B legacy mode IRQ selecting, then MCR bit 3 is not effective on
= 0
= 1
= 0xx Parallel Port Mode
= 100 Reserved
= 101 External FDC Mode
= 110 Reserved
= 111 External two FDC Mode
= 0 KBRST
= 1 GP12
= 0
= 1
=
= 01 GP24
= 10 8042 P13
= 11 Reserved
on selecting IRQ
effective on selecting IRQ
selecting IRQ
on selecting IRQ
IRQ
selecting IRQ
IRQ
selecting IRQ
00 CIRRX
GP11
GA20
Disable IRQ Sharing
Enable IRQ Sharing
-135 -
Publication Release Date: Auguest 1997
W83977ATF
PRELIMINARY
Revision 0.51