NH82801GHM S L8YR Intel, NH82801GHM S L8YR Datasheet - Page 624

• Manufacturer Part Number: NH82801GHM S L8YR
• Manufacturer: Intel

Specifications of NH82801GHM S L8YR

• Lead Free Status / RoHS Status: Compliant

16.1.10
Note:
624
NAMBAR—Native Audio Mixer Base Address Register
(Audio—D30:F2)
Address Offset: 10
Default Value:
Lockable:
The Native PCI Mode Audio function uses PCI Base Address register #1 to request a
contiguous block of I/O space that is to be used for the Native Audio Mixer software
interface. The mixer requires 256 bytes of I/O space. Native Audio Mixer and Modem
codec I/O registers are located from 00h to 7Fh and reside in the codec. Access to
these registers will be decoded by the AC '97 controller and forwarded over the AC-link
to the codec. The codec will then respond with the register value.
In the case of the split codec implementation, accesses to the different codecs are
differentiated by the controller by using address offsets 00h
and address offsets 80h
The tertiary codec cannot be addressed via this address space. The tertiary space is
only available from the new MMBAR register. This register powers up as read only and
only becomes write-able when the IOSE bit in offset 41h is set.
For description of these I/O registers, refer to the Audio Codec ‘97 Component
Specification, Version 2.3.
31:16
15:8
7:1
Bit
0
Hardwired to 0s.
Base Address — R/W. These bits are used in the I/O space decode of the Native Audio
Mixer interface registers. The number of upper bits that a device actually implements
depends on how much of the address space the device will respond to. For the AC ‘97
mixer, the upper 16 bits are hardwired to 0, while bits 15:8 are programmable. This
configuration yields a maximum I/O block size of 256 bytes for this base address.
Reserved. Read as 0s.
Resource Type Indicator (RTE) — RO. This bit defaults to 0 and changes to 1 if the
IOSE bit is set (D30:F2:Offset 41h, bit 0). When 1, this bit indicates a request for I/O
space.
00000001h
No
–
13h
–
FEh for the secondary codec.
AC ’97 Audio Controller Registers (D30:F2) (Desktop and Mobile Only)
Description
Attribute:
Size:
Power Well:
–
7Fh for the primary codec
Intel
R/W, RO
32 bits
Core
®
ICH7 Family Datasheet