FW82801DBM S L6DN Intel, FW82801DBM S L6DN Datasheet - Page 495
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FW82801DBM S L6DN
Manufacturer Part Number
FW82801DBM S L6DN
Description
Manufacturer
Intel
Datasheet
1.FW82801DBM_S_L6DN.pdf
(615 pages)
Specifications of FW82801DBM S L6DN
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14.1.11
14.1.12
Intel
®
82801DBM ICH4-M Datasheet
Note: The DMA registers for S/PDIF and Microphone In 2 cannot be addressed via this address space.
NABMBAR—Native Audio Bus Mastering Base Address
Register (Audio—D31:F5)
Address Offset:
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 Mode Audio software interface.
These DMA functions are only available from the new MBBAR register. This register powers up
as read only and only becomes write-able when the IOSE bit in offset 41h is set.
MMBAR—Mixer Base Address Register (Audio—D31:F5)
Address Offset:
Default Value:
Lockable:
This BAR creates 512 bytes of memory space to signify the base address of the register space. The
lower 256 bytes of this space map to the same registers as the 256-byte I/O space pointed to by
NAMBAR. The lower 384 bytes are divided as follows:
•
•
•
•
31:16
15:6
31:9
Bit
5:1
Bit
8:3
2:1
0
128 bytes for the primary codec (offsets 00–7Fh)
128 bytes for the secondary codec (offsets 80–FFh)
128 bytes for the tertiary codec (offsets 100–17Fh).
128 bytes of reserved space (offsets 180–1FFh), returning all 0s.
0
Hardwired to 0s
Base Address — R/W. These bits are used in the I/O space decode of the Native Audio Bus
Mastering 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 AC '97 bus mastering, the upper
16 bits are hardwired to 0, while bits 15:6 are programmable. This configuration yields a maximum
I/O block size of 64 bytes for this base address.
Reserved. Read as 0s.
Resource Type Indicator (RTE) — RO. This bit is set to 0, indicating a request for I/O space.
Base Address — R/W Lower 32-bits of the 512-byte memory offset to use for decoding the
primary, secondary, and tertiary codec’s mixer spaces.
Reserved. Read as 0s.
Type — RO. Indicates the base address exists in 32-bit address space
Resource Type Indicator (RTE) — RO. Hardwired to 0, indicating a request for memory space.
14
00000001h
No
18
00000000h
No
–
–
17h
1Bh
Description
Description
AC ’97 Audio Controller Registers (D31:F5)
Attribute:
Size:
Power Well:
Attribute:
Size:
Power Well:
R/W, RO
32 bits
Core
R/W, RO
32 bits
Core
495
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