Specifications

Intel
®
810E2 Chipset Platform
R
Design Guide 85
3.21.2.2. Power and Ground Connections
Comply with the following rules and guidelines for power and ground connections:
• All VCC pins should be connected to the same power supply.
• All VSS pins should be connected to the same ground plane.
• Use one decoupling capacitor per power pin for optimized performance.
• Place decoupling as close as possible to power pins.
General Power and Ground Plane Considerations
To properly implement the common-mode choke functionality of the magnetics module, the chassis or
output ground (secondary side of transformer) should be physically separated from the digital or input
ground (primary side) by at least 100 mils.
Figure 50. Ground Plane Separation
GND_Plane_Separ
Separate Chassis Ground Plane
0.01" minimum separation
Magnetics Module
Separate Chassis Ground Plane Ground plane
Good grounding requires minimizing inductance levels in the interconnections. Keeping ground returns
short, signal loop areas small, and power inputs bypassed to signal return will significantly reduce EMI
radiation.