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參數(shù)資料
| 型號： | pentium III CPU |
| 廠商： | Intel Corp. |
| 英文描述： | Pentium III Processor for the SC242 at 450MHz to 1.0GHz(SC242工作頻率450MHZ到1GHZ奔III處理器) |
| 中文描述： | 奔騰III處理器在450MHz至1.0GHz的（SC242工作頻率至450MHz到1GHz的奔三處理器的SC242） |
| 文件頁數(shù)： | 42/102頁 |
| 文件大?。?/td> | 920K |
| 代理商： | PENTIUM III CPU |
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42
Datasheet
Pentium
III Processor for the SC242 at 450 MHz to 1.0 GHz
3.2.4
Reading Overshoot/Undershoot Specification Tables
The overshoot/undershoot specification for the Pentium
III
processor is not a simple single value.
Instead, many factors are needed to determine what the over/undershoot specification is. In
addition to the magnitude of the overshoot, the following parameters must also be known: the
width of the overshoot (as measured above 1.635 V) and the Activity Factor (AF). To determine
the allowed overshoot for a particular overshoot event, you must do the following:
1. Determine the signal group that particular signal falls into. If the signal is an AGTL+ signal
operating with a 100 MHz system bus, use
Table 20
. If the signal is an AGTL+ signal
operating with a 133 MHz system bus, use
Table 21
. If the signal is a CMOS signal, use
Table 22
.
2. Determine the Magnitude of the overshoot (relative to V
SS
).
3. Determine the Activity Factor (how often does this overshoot occur).
4. From the appropriate Specification table, read off the Maximum Pulse Duration (in ns)
allowed.
5. Compare the specified Maximum Pulse Duration to the signal being measured. If the Pulse
Duration measured is less than the Pulse Duration shown in the table, then the signal meets the
specifications.
The above procedure is similar for undershoots after the undershoot waveform has been converted
to look like an overshoot. Undershoot events must be analyzed separately from Overshoot events
as they are mutually exclusive.
Below is an example showing how the maximum pulse duration is determined for a given
waveform and how it relates to a measured value:
Platform Information:
Signal Group = 133 MHz AGTL+
Overshoot Magnitude (measured) = 2.3 V
Pulse Duration (measured) = 1.6 ns
Activity Factor (measured) = 0.1
Corresponding Maximum Pulse Duration Specification = 1.9 ns
Given the above parameters and using table 21 (AF = 0.1 column), the maximum allowed pulse
duration is 1.9 ns. Since the measured pulse duration is 1.6 ns, this particular overshoot event
passes the overshoot specifications, although this doesn't guarantee that the combined overshoot/
undershoot events meet the specifications.
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