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| 型號： | pentium pro processor |
| 廠商： | Intel Corp. |
| 英文描述： | Pentium Pro Processor with 1MB L2 Cache at 200MHZ(1兆比特L2高速緩存頻率200兆赫茲處理器) |
| 中文描述： | 奔騰Pro處理器在200MHz（1兆比特二級高速緩存頻率200兆赫茲處理器帶有1MB的L2緩存） |
| 文件頁數(shù)： | 10/39頁 |
| 文件大?。?/td> | 930K |
| 代理商： | PENTIUM PRO PROCESSOR |
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AP-523
E
10
condition. Sequencing applies to the power voltage levels
and the levels of certain other crucial signals.
Figure 7 shows an example of power voltage sequencing.
Here voltage levels A and B are shown to trade places
with each other. On power-on, A-B may be larger at any
point than they will be once they reach their nominal
levels. On power-off, the voltage B input may actually be
higher than the voltage A input for some period of time.
The Pentium Pro processor, GTL+ bus, and Intel’s
chipsets have been designed such that no additional
circuitry is required in the power system to ensure the
order of voltage sequencing. However, systems should
be designed such that neither supply stays on
permanently while the other is off. The long term
reliability of the component can be compromised by
excessive exposure to these conditions.
The discussion following is simplified by assuming the
worst case which is one voltage on while the other is off.
See Figure 8 and Figure 9 for highly simplified models of
the buffers that show the ESD protection diodes. This
model is provided for discussion purposes only and is not
meant to imply any implementation scheme.
A
Nom
B
Nom
A rising first, falling first
B Rises later,
falls later
Time
Volts
B > A
A-B > A
Nom
-B
Nom
Figure 7. Voltage Sequencing Example
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