Intel Celeron 1.8MHz RK80531RC033128 Data Sheet

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After the true waveform conversion, the undershoot/overshoot specifications shown in 

 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 

 and 

. 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.

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. 

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 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.

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 

 and 

 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).

Activity factor for AGTL+ signals is referenced to BCLK frequency.

Activity factor for CMOS signals is referenced to PICCLK frequency.