FW82801EB Intel, FW82801EB Datasheet - Page 564

• Manufacturer Part Number: FW82801EB
• Manufacturer: Intel

Specifications of FW82801EB

• Lead Free Status / RoHS Status: Not Compliant

AC ’97 Modem Controller Registers (D31:F6)
16.1.10
16.1.11
564
MMBAR—Modem Mixer Base Address Register
MBAR—Modem 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
for the secondary codec.
(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
7:1
6:1
Bit
Bit
0
0
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 0.
Resource Type Indicator (RTE) — RO. Hardwired to 1indicating 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 0.
Resource Type Indicator (RTE) — RO. Hardwired to 1 indicating a request for I/O space.
10
00000001h
14
00000001h
–
–
13h
17h
–
7Fh for the primary codec and address offsets 80h
Intel
Description
Description
Attribute:
Size:
Attribute:
Size:
®
82801EB ICH5 / 82801ER ICH5R Datasheet
R/W, RO
32 bits
R/W, RO
32 bits
–
FEh