FW82801DBM S L6DN Intel, FW82801DBM S L6DN Datasheet - Page 519

• Manufacturer Part Number: FW82801DBM S L6DN
• Manufacturer: Intel

Specifications of FW82801DBM S L6DN

• Lead Free Status / RoHS Status: Not Compliant

15.1.10
15.1.11
Intel
®
82801DBM ICH4-M Datasheet
MMBAR—Modem Mixer Base Address Register
(Modem—D31:F6)
Address Offset:
Default Value:
The Native PCI Mode Modem uses PCI Base Address register #1 to request a contiguous block of
I/O space that is to be used for the Modem Mixer software interface. The mixer requires 256 bytes
of I/O space. All accesses to the mixer registers are forwarded over the AC-link to the codec where
the registers reside.
In the case of the split codec implementation accesses to the different codecs are differentiated by
the controller by using address offsets 00h
80h
MBAR—Modem Base Address Register (Modem—D31:F6)
Address Offset:
Default Value:
The Modem function uses PCI Base Address register #1 to request a contiguous block of I/O space
that is to be used for the Modem software interface. The Modem Bus Mastering register space
requires 128 bytes of I/O space. All Modem registers reside in the controller, therefore cycles are
not forwarded over the AC-link to the codec.
31:16
31:16
15:8
15:7
Bit
7:1
Bit
6:1
0
0
–
FEh for the secondary codec.
Hardwired to 0s
Base Address — R/W. These bits are used in the I/O space decode of the Modem 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 Modem, 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 is set to 1, indicating a request for I/O space.
Hardwired to 0s
Base Address — R/W. These bits are used in the I/O space decode of the Modem 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 Modem, the upper 16 bits are hardwired to
0, while bits 15:7 are programmable. This configuration yields a maximum I/O block size of 128
bytes for this base address.
Reserved. Read as 0s
Resource Type Indicator (RTE) — RO. This bit is set to 1, indicating a request for I/O space.
10
00000001h
14
00000001h
–
–
13h
17h
–
7Fh for the primary codec and address offsets
Description
Description
AC ’97 Modem Controller Registers (D31:F6)
Attribute:
Size:
Attribute:
Size:
R/W, RO
32 bits
R/W, RO
32 bits
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