參數(shù)資料
型號(hào)： Embedded Pentium 266
廠商： Intel Corp.
英文描述： Low-Power Embedded Pentium Processor with MMX Technology(低能量嵌入式帶MMX技術(shù)奔騰處理器)
中文描述： 低功耗嵌入式處理器奔騰MMX技術(shù)（低能量嵌入式帶MMX公司的技術(shù)奔騰處理器）
文件頁(yè)數(shù)： 61/62頁(yè)
文件大小： 1130K
代理商： EMBEDDED PENTIUM 266
Low-Power Embedded Pentium
Processor with MMX Technology
Advance Information Datasheet
61
Although simulated settling time has not shown good correlation with physical, measured settling
time, settling time simulations can still be used as a tool to tune layouts. Use the following
procedure to verify board simulation and tuning with concerns for settling time:
1. Simulate settling time at the slow corner for a particular signal.
2.
If settling time violations occur (signal requires more than 12.5 ns to settle to ±10% of its final
value), simulate signal trace with DC diodes in place at the receiver pin. The DC diode
behaves almost identically to the actual (non-linear) diode on the part as long as excessive
overshoot does not occur.
3. If settling time violations still occur, simulate flight times for five consecutive cycles for that
particular signal.
4. If flight time values are consistent over the five simulations, settling time should not be a
concern. If, however, flight times are not consistent over the five consecutive cycles, tuning of
the layout is required.
5. Note that, for signals that are allocated two cycles for flight time, the recommended settling
time is doubled. Maximum Settling Time to within 10 percent of V
IH
or V
IL
is 12.5 ns at
66 MHz.
4.5.5
Measurement Methodology
The waveform of the input signals should be measured at the processor pins using an oscilloscope
with a 3 dB bandwidth of at least 20 MHz (100 ms/s digital sampling rate). There should be a short
isolation ground lead attached to a processor pin on the bottom side of the board. A 1-M
probe
with loading of less than 1 pF is recommended. The measurement should be taken at the input pins
and their nearest V
SS
pins.
Figure 26. Settling Time
000276
2.5V
Settling Time
V Min –10%
V Max +10%
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