Intel Pentium III Processor for the SC242 at 450 MHz to 1.0 GHz

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Signal Quality Specifications3.2.2 Overshoot/Undershoot Pulse DurationOvershoot/Undershoot Pulse duration describes the total time an overshoot/undershoot eventexceeds the Overshoot/Undershoot Reference Voltage (V OS_REF = 1.635 V). The total time couldencompass several oscillations above the Reference Voltage. Multiple overshoot/undershoot pulseswithin a single overshoot/undershoot event may need to be measured to determine the total PulseDuration.Note:Note:Oscillations below the Reference Voltage can not be subtracted from the total Overshoot/Undershoot Pulse Duration.Multiple Overshoot/Undershoot events occurring within the same clock cycle must be consideredtogether as one event. Using the worst case Overshoot/Undershoot Magnitude, sum together theindividual Pulse Durations to determine the total Overshoot/Undershoot Pulse Duration for thattotal event.3.2.3 Overshoot/Undershoot Activity FactorActivity Factor (AF) describes the frequency of overshoot (or undershoot) occurrence relative to aclock. Since the highest frequency of assertion of an AGTL+ or a CMOS signal is every otherclock, an AF = 1 indicates that the specific overshoot (or undershoot) waveform occurs EVERYOTHER clock cycle. Thus, an AF = 0.01 indicates that the specific overshoot (or undershoot)waveform occurs one time in every 200 clock cycles.The Overshoot/Undershoot Specifications (Table 20 through Table 22) show the Maximum PulseDuration allowed for a given Overshoot/Undershoot Magnitude at a specific Activity Factor. Eachtable entry is independent of all others, meaning that the Pulse Duration reflects the existence ofovershoot/undershoot events of that Magnitude ONLY. A platform with an overshoot/undershootthat just meets the Pulse Duration for a specific Magnitude where the AF < 1, means that there canbe NO other overshoot/undershoot events, even of lesser Magnitude (note that if AF = 1, then theevent occurs at all times and no other events can occur).Note:Note:Note:Overshoot (rising edge) and undershoot (falling edge) conditions are separate and their impactmust be determined independently.Activity factor for AGTL+ signals is referenced to BCLK frequency.Activity factor for CMOS signals is referenced to PICCLK frequency.42 Datasheet
Signal Quality Specifications3.2.4 Reading Overshoot/Undershoot Specification TablesThe 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. Inaddition to the magnitude of the overshoot, the following parameters must also be known: thewidth of the overshoot (as measured above 1.635 V) and the Activity Factor (AF). To determinethe 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+ signaloperating with a 100 MHz system bus, use Table 20. If the signal is an AGTL+ signaloperating with a 133 MHz system bus, use Table 21. If the signal is a CMOS signal, useTable 22.2. Determine the Magnitude of the overshoot (relative to VSS).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 PulseDuration measured is less than the Pulse Duration shown in the table, then the signal meets thespecifications.The above procedure is similar for undershoots after the undershoot waveform has been convertedto look like an overshoot. Undershoot events must be analyzed separately from Overshoot eventsas they are mutually exclusive.Below is an example showing how the maximum pulse duration is determined for a givenwaveform 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) = 0.1Corresponding Maximum Pulse Duration Specification = 1.9 nsGiven the above parameters and using Table 21 (AF = 0.1 column), the maximum allowed pulseduration is 1.9 ns. Since the measured pulse duration is 1.6 ns, this particular overshoot eventpasses the overshoot specifications, although this doesn't guarantee that the combined overshoot/undershoot events meet the specifications.Datasheet 43
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Intel Pentium III Processor for the SC242 at 450 MHz to 1.0 GHz

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