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82801CA Datasheet, PDF (419/521 Pages) Intel Corporation – I/O Controller Hub 3-S (ICH3-S) | |||
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AC â97 Audio Controller Registers (D31:F5)
13.1.15
INTR_PNâInterrupt Pin Register (AudioâD31:F5)
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 â97 module interrupt. The AC â97
interrupt is internally ORâed to the interrupt controller with the PIRQB# signal.
Bit
Description
7:3 Reserved.
2:0 Interrupt Pin (INT_PN)âRO. Hardwired to 010b to select PIRQB#.
13.1.16 PCIDâProgrammable Codec ID Register (AudioâD31:F5)
Address Offset: 40h
Default Value: 01h
Lockable:
No
Attribute:
Size:
Power Well:
R/W
8 bits
Core
Note: The value in this register must only be modified prior to any AC â97 codec accesses.
Bit
Description
7:2 Reserved.
Secondary Codec ID (SCID)âR/W. These two bits define the encoded ID that is used to address
1:0
the secondary codec I/O space. The two bits are the ID that will be placed on slot-0, bits 0 and 1,
upon an I/O access to the secondary codec. Bit 1 is the first bit sent and bit 0 is the second bit sent
on AC_SDATA_OUT during slot 0.
Intel® 82801CA ICH3-S Datasheet
419
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