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Intel
®
820E Chipset
R
104 Design Guide
2.22.1.1. Bus Topologies
The LAN Connect Interface can be configured in several topologies, as follows:
• Direct point-to-point connection between the ICH2 and the LAN component
• Dual footprint (see Section 2.22.6.)
• LOM/CNR implementation
2.22.1.2. Point-to-Point Interconnect
The following are guidelines for a single-solution motherboard. Either the Intel 82562EH component,
Intel
82562ET component or CNR is installed.
Figure 65. Single-Solution Interconnect
IO_subsys_single_sol_interconn
ICH2
Platform LAN
Connect
(PLC)
LAN_TXD[2:0]
LAN_RXD[2:0]
LAN_RSTSYNC
LAN_CLK
L
Length requirements for Figure 65:
Intel 82562EH: L = 4.5 inches to 10.0 inches (Signal lines LAN_RXD[2:1] and LAN_TXD[2:1] are
not connected.)
Intel 82562ET: L = 3.5 inches to 10.0 inches
CNR*: L = 3.0 inches to 9.0 inches (0.5 inch to 3.0 inches on card)
2.22.1.3. LOM/CNR Interconnect
The following guidelines enable an all-inclusive motherboard solution. This layout combines the LOM,
dual footprint, and CNR solutions. The resistor pack ensures that either a CNR option or a LAN-on-
motherboard option can be implemented at one time. The following figures show a model of this. The
recommended trace routing lengths are shown in Table 23.