參數(shù)資料
型號(hào): 24707_PUB
英文描述: Programmable Resolution 1-Wire Digital Thermometer
中文描述: 時(shí)鐘發(fā)生器規(guī)格的AMD Athlon? 64和AMD Opteron?處理器
文件頁(yè)數(shù): 38/51頁(yè)
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代理商: 24707_PUB
Clock Generator Specification for AMD64 Processors
24707 Rev. 3.08 September 2003
7.3.8
Differential Processor Clock Motherboard Termination Scheme
The processor clock motherboard termination scheme is comprised of 15 ohm series resistor
terminations located within 0.5” of clock generator, ~5” 100 ohm differential transmission line,
AC coupling caps and 169 ohm differential termination located <0.5” from the processor
CPUCLK pins.
The 100 ohm differential transmission lines are generated on the PCB using the stack-up and trace
spacing shown in
Figure 5. The closest-neighboring signal must be at least 20 mils from the
CPUCLK differential pair to reduce motherboard crosstalk effects. The differential pair should be
routed with 25 mil length matching between the true and compliment signals. For best signal
integrity, these traces should be routed referenced to ground without crossing any plane splits.
A standard 4-layer motherboard stack-up is shown
in
Figure 5
.
Figure 5. Four-Layer Motherboard Stack-Up and Impedance
34
Electrical Specifications
Chapter 7
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