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82801DB Datasheet, PDF (499/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)
AC ’97 Modem Controller Registers (D31:F6)
15.1.15 INTR_LN—Interrupt Line Register (Modem—D31:F6)
Address Offset: 3Ch
Default Value: 00h
Lockable:
No
Attribute:
Size:
Power Well:
R/W
8 bits
Core
This register indicates which PCI interrupt line is used for the AC ’97 module interrupt.
Bit
Description
7:0
Interrupt Line (INT_LN) — R/W. This data is not used by the ICH4. It is used to communicate to
software the interrupt line that the interrupt pin is connected to.
15.1.16
INT_PIN—Interrupt Pin (Modem—D31:F6)
Address Offset: 3Dh
Default Value: 02h
Lockable:
No
Attribute:
Size:
Power Well:
RO
8 bits
Core
This register indicates which PCI interrupt pin is used for the AC ’97 modem interrupt. The AC ’97
interrupt is internally OR’d to the interrupt controller with the PIRQB# signal.
Bit
Description
7:3 Reserved
2:0 Interrupt Pin (INT_PN) — RO. Hardwired to 010b to select PIRQB#.
15.1.17
PID—PCI Power Management Capability ID Register
(Modem—D31:F6)
Address Offset:
Default Value:
Lockable:
50h
0001h
No
Attribute:
Size:
Power Well:
RO
16 bits
Core
Bit
Description
15:8 Next Capability (NEXT) — RO. This field indicates that this is the last item in the list.
7:0
Capability ID (CAP) — RO. This field indicates that this pointer is a message signaled interrupt
capability.
Intel® 82801DB ICH4 Datasheet
499