w83877atd Winbond Electronics Corp America, w83877atd Datasheet - Page 141

• Manufacturer Part Number: w83877atd
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

Bit 3: Reserved.
IRQMODS (Bit 2):
IRQ mode seleection. The W83877ATF supports: (1) legacy ISA IRQ mode or ISA IRQ sharing
mode. (2) Serial IRQ mode used in the PCI bus. In the legacy ISA IRQ sharing mode, the selected
IRQ pin for the device's IRQ is defined in the configuration registers CR27 - CR29. In the ISA IRQ
sharing mode, configuration register CR18 indicates which IRQ pin is in the IRQ sharing mode.
Bit 1 - bit 0: Reserved.
8.2.40 Configuration Register 32 (CR32), default=00H
When the device is in Extended Function mode and EFIR is 32H, the CR32 register can be accessed
through EFDR. The bit definitions are as follows:
CR27[7:4]
0:
1:
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
legacy ISA IRQ mode or ISA IRQ sharing mode.(default)
Serial IRQ mode used in PCI bus.
7
IRQ/Data Frame Period
Reserved for
6
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
None
IRQ1
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
5
4
SMI
3
- 137 -
2
1
0
Publication Release Date: April 1998
URBPME
URAPME
FDCPME
PRTPME
reserved
reserved
reserved
CHIPPME
W83877ATF
Version 0.51