Design Guide
7
Differential Clocking ......................................................................... 151
PCI Bus Clock Control...................................................................... 152
Heatsink Effects ............................................................................... 153
EMI Ground Frames and Faraday Cages ........................................ 153
EMI Test Capabilities ....................................................................... 154
Retention Mechanism Placement and Keep-Outs ............................................ 155
11.3.1
Grounding Techniques ..................................................................... 157
Platform Power Delivery Guidelines
.............................................................. 159
Customer Reference Board Power Delivery ..................................................... 159
12.1.1
Processor Core Voltage ...................................................................161
Power Summary ............................................................................... 162
Processor Power Requirements....................................................... 162
Multiple Voltages ................................................................ 162
Voltage Tolerance............................................................... 163
Processor Current Requirements ..................................................... 163
Power Delivery Layout Requirements .............................................. 163
Voltage Regulator Requirements ..................................................... 164
Input Voltages and Currents ............................................... 165
Power Good Output (PWRGD)........................................... 165
Fault Protection...................................................................166
VR Module 9.1 Recommendations................................................... 166
VR Down Recommendations ........................................................... 167
Voltage Sequencing ......................................................................... 169
VCCA, VCCIOPLL, and VSSA Filter Specifications ......................... 171
Processor Decoupling ...................................................................... 173
High-Frequency Decoupling ............................................... 173
Bulk Decoupling.................................................................. 175
GTLREF[3:0] .................................................................................... 175
Component Models ..........................................................................177
Measuring Transients ....................................................................... 177
DDR_VTT (1.25 V) Decoupling ........................................................ 177
VCC_CPU (1.45 V Power Plane) ..................................................... 177
DDR (2.5 V Power Plane) ................................................................ 178
Hub Interface (1.2 V Power Plane)................................................... 178
Filter Specifications (1.2V Power Plane) ..........................................179
MCH Power Sequencing Requirement ............................................ 180
ICH3-S Power Delivery Guidelines ......................................................... 181
1.8 V/3.3 V Power Sequencing ........................................................ 181
3.3V/V5REF Sequencing ................................................................. 182
ICH3-S Power Rails................................................................ 183
ICH3-S Decoupling Recommendations.................................. 183
Содержание Xeon
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