243658-020 Datasheet, PDF (60/128 Pages) Intel Corporation – Intel Celeron Processor up to 1.10 GHz

Intel^® Celeron^® Processor up to 1.10 GHz
After the true waveform conversion, the undershoot/overshoot specifications shown in Table 38
and Table 39 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 38 and Table 39. 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.
3.4.3
Overshoot/Undershoot Pulse Duration (FC-PGA/FC-PGA2 Packages)
Pulse duration describes the total time an overshoot/undershoot event exceeds the overshoot/
undershoot reference voltage (Vos_ref = 1.635 V). 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 subtracted 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 Durations to determine the total Overshoot/Undershoot Pulse Duration for that
total event.
3.4.4
Activity Factor (FC-PGA/FC-PGA2 Packages)
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 38 and Table 39 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 that just
meets the pulse duration for a specific magnitude where the AF < 1, means that there can be NO
other overshoot/undershoot events, even of lesser magnitude (note that if AF = 1, then the event
occurs at all times and no other events can occur).
Note: Activity factor for AGTL+ signals is referenced to BCLK frequency.
Note: Activity factor for CMOS signals is referenced to PICCLK frequency.
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Datasheet