W83877TF Datasheet, PDF (128/154 Pages) Winbond – I/O chip disk drive adapter

W83877TF
IRQMODS (Bit 2):
IRQ mode selection. The W83877TF 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.
0: legacy ISA IRQ mode or ISA IRQ sharing mode.(default)
1: Serial IRQ mode used in PCI bus.
Bit 1 - bit 0: Reserved.
8.2.37 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:
765
43
21
0
URBPME
URAPME
FDCPME
PRTPME
reserved
reserved
reserved
CHIPPME
CHIPPME (Bit 7): W83877TF chip power management enable.
0
disable the ACPI/Legacy and the auto power management functions.
1
enable the ACPI/Legacy and the auto power management functions.
Bit 6 - bit 4: Reserved.
PRTPME (Bit 3): Printer port power management enable.
0
disable the auto power management function.
1
enable the auto power management function, if this bit and CHIPPME(CR32 bit
7) are both set to 1.
.
FDCPME (Bit 2): FDC power management enable.
0
disable the auto power management function.
1
enable the auto power management function, if this bit and CHIPPME(CR32 bit
7) are both set to 1.
.
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Publication Release Date: March 1998
Version 0.61