6
Design Guide
Plane Splits, Voids, and Cut-Outs (Anti-Etch) .................................. 125
VCC Plane Splits, Voids, and Cut-Outs (Anti-Etch)............ 125
GND Plane Splits, Voids, and Cut-Outs (Anti-Etch) ........... 125
EMI Considerations .......................................................................... 125
USB Power Line Layout Topologies................................................. 126
ICH3-S SMBus/SMLink Interface ............................................................ 126
SMBus Design Considerations......................................................... 127
General Design Note........................................................................ 127
The Unified VCC_CORE Architecture.............................................. 127
Real Time Clock (RTC) ..................................................................................... 128
9.6.1
RTC External Circuit......................................................................... 129
External Capacitors .......................................................................... 130
RTC Layout Considerations ............................................................. 131
RTC External Battery Connection .................................................... 131
RTC External RTCRST# Circuit ....................................................... 132
VBIAS DC Voltage and Noise Measurements ................................. 132
RTC-Well Input Strap Requirements................................................ 133
Internal LAN Layout Guidelines ........................................................................ 133
9.7.1
LCI (LAN Connect Interface) Guidelines .......................................... 135
Bus Topology...................................................................... 135
Signal Routing and Layout ................................................. 136
Crosstalk Consideration ..................................................... 136
Impedances ........................................................................ 136
Line Termination ................................................................. 136
General LAN Routing Guidelines and Considerations ..................... 137
General Trace Routing Considerations .............................. 137
Trace Geometry and Length............................................... 138
Signal Isolation ................................................................... 138
Power and Ground Connections ........................................ 138
General Power and Ground Plane Consideration .............. 139
Board Design ...................................................................... 140
Common Physical Layout Issues ....................................... 140
82562ET/EM Guidelines ........................................................ 142
82562ET/EM Component Placement 142
Crystals and Oscillators ...................................................... 142
82562ET/EM Termination Resistors......................... 143
Critical Dimensions........................................................................... 143
Terminating Unused Connections .................................................... 145
................................................................................................................ 147
EMI and Mechanical Design Considerations
.............................................. 149
Brief EMI Theory .............................................................................. 149
EMI Regulations and Certifications .................................................. 150
EMI Design Considerations............................................................................... 150
11.2.1
Spread Spectrum Clocking (SSC).................................................... 150
Содержание Xeon
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