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參數(shù)資料
| 型號(hào)： | pentium III |
| 廠商： | Intel Corp. |
| 英文描述： | pentium III Processor for the PGA370 Socket at 500MHz to 933MHz(工作頻率500到933兆赫茲活動(dòng)帶PGA370插孔奔III處理器) |
| 中文描述： | 奔騰III處理器在500MHz到933MHz的（工作頻率500到933兆赫茲活動(dòng)帶PGA370插孔奔三處理器的PGA370插座） |
| 文件頁數(shù)： | 39/78頁 |
| 文件大?。?/td> | 610K |
| 代理商： | PENTIUM III |
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Datasheet
39
Pentium
III Processor for the PGA370 Socket at 500 MHz to 933 MHz
3.3.2
Overshoot/Undershoot Magnitude
Magnitude describes the maximum potential difference between a signal and its voltage reference
level, V
SS
(overshoot) and V
TT
(undershoot). While overshoot can be measured relative to V
SS
using one probe (probe to signal and GND lead to V
SS
), undershoot must be measured relative to
V
TT
. This could be acomplished by simultaneously measuring the V
TT
plane while measuring the
signal undershoot. Today’s oscilloscopes can easily calculate the true undershoot waveform. The
true undershoot waveform can also be obtained with the following oscilloscope data file analysis:
Converted Undershoot Waveform = V
TT
- Signal_measured
Note:
The converted undershoot waveform appears as a positive (overshoot) signal.
Note:
Overshoot (rising edge) and undershoot (falling edge) conditions are separate and their impact
must be determined independently.
After the true waveform conversion, the undershoot/overshoot specifications shown in
Table 20
through
Table 22
can be applied to the converted undershoot waveform using the same magnitude
and pulse duration specifications used with an overshoot waveform.
Overshoot/undershoot magnitude levels must observe the Absolute Maximum Specifications listed
in
Table 20
through
Table 22
. These specifications must not be violated at any time regardless of
bus activity or system state. Within these specifications are threshold levels that define different
allowed pulse durations. Provided that the magnitude of the overshoot/undershoot is within the
Absolute Maximum Specifications (2.18V), the pulse magnitude, duration and activity factor must
all be used to determine if the overshoot/undershoot pulse is within specifications.
3.3.3
Overshoot/Undershoot Pulse Duration
Pulse duration describes the total time an overshoot/undershoot event exceeds the overshoot/
undershoot reference voltage (Vos_ref = 1.635V). The total time could encompass several
oscillations above the reference voltage. Multiple overshoot/undershoot pulses within a single
overshoot/undershoot event may need to be measured to determine the total pulse duration.
Note:
Oscillations below the reference voltage can not be substracted from the total overshoot/
undershoot pulse duration.
Note:
Multiple Overshoot/Undershoot events occurring within the same clock cycle must be considered
together as one event. Using the worst case Overshoot/Undershoot Magnitude, sum together the
individual Pulse Duraitons to determine the total Overshoot/Undershoot Pulse Duration for that
total event.
3.3.4
Activity Factor
Activity Factor (AF) describes the frequency of overshoot (or undershoot) occurrence relative to a
clock. Since the highest frequency of assertion of an AGTL+ or a CMOS signal is every other
clock, an AF = 1 indicates that the specific overshoot (or undershoot) waveform occurs EVERY
OTHER clock cycle. Thus, an AF = 0.01 indicates that the specific overshoot (or undershoot)
waveform occurs one time in every 200 clock cycles.
The specifications provided in
Table 20
through
Table 22
show the Maximum Pulse Duration
allowed for a given Overshoot/Undershoot Magnitude at a specific Activity Factor. Each Table
entry is independent of all others, meaning that the Pulse Duration reflects the existence of
overshoot/undershoot events of that magnitude ONLY. A platform with an overshoot/undershoot
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