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Intel
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820E Chipset
R
90 Design Guide
Valid Codec Configurations
Table 19. Codec Configurations
Valid Codec Configurations
Invalid Codec Configurations
AC(Primary) MC(Primary) + X(any other type of codec)
MC(Primary) AMC(Primary) + AMC(Secondary)
AMC(Primary) AMC(Primary) + MC(Secondary)
AC(Primary) + MC(Secondary)
AC(Primary) + AC(Secondary)
AC(Primary) + AMC(Secondary)
2.13.2. Communication and Networking Riser (CNR)
Related Documents:
Communication Network Riser Specification, Revision 1.1, available at:
http://developer.intel.com/technology/cnr
The Communication and Networking Riser (CNR) Specification defines a hardware scalable Original
Equipment Manufacturer (OEM) motherboard riser and interface. This interface supports multi-channel
audio, V.90 analog modem, phone-line based networking, and 10/100 Ethernet based networking. The
CNR specification defines the interface, which should be configured prior to shipment of the system.
Standard I/O expansion slots, such as those supported by the PCI bus architecture, are intended to
continue serving as the upgrade medium. The CNR mechanically shares a PCI slot. Unlike the AMR,
the system designer will not sacrifice a PCI slot if they decide not to include a CNR in a particular build.
It is required that the CNR A0-A2 pins be set to a unique address, so that the CNR EEPROM can be
accessed. See CNR specification.
Figure 55 indicates the interface for the CNR connector. Refer to the appropriate section of this
document for the corresponding design and layout guidelines. The Platform LAN Connection (PLC) can
either be an Intel 82562EH or Intel 82562EM component. Refer to the CNR specification for additional
information.
Figure 55. CNR Interface
Core Logic
Controller
AC '97 Interface
CNR Connector
Communication and
Networking Riser
(up to 2 AC'97 codecs &
one PLC Device)
Power
USB
LAN Interface
Reserved
SMBus