Intel Pentium 4 672 HH80547PG1122MH User Manual
Product codes
HH80547PG1122MH
Intel
®
Pentium
®
4 Processor in the 423-pin Package
33
3.3
System Bus Signal Quality Specifications and
Measurement Guidelines
Measurement Guidelines
3.3.1
Overshoot/Undershoot Guidelines
Overshoot (or undershoot) is the absolute value of the maximum voltage above or below V
SS
. The
overshoot/undershoot specifications limit transitions beyond V
CC
or V
SS
due to the fast signal edge
rates. The processor can be damaged by repeated overshoot or undershoot events on any input,
output, or I/O buffer if the charge is large enough (i.e., if the over/undershoot is great enough).
Determining the impact of an overshoot/undershoot condition requires knowledge of the
magnitude, the pulse direction, and the activity factor (AF) of the incident waveform. Permanent
damage to the processor is the likely result of excessive overshoot/undershoot.
output, or I/O buffer if the charge is large enough (i.e., if the over/undershoot is great enough).
Determining the impact of an overshoot/undershoot condition requires knowledge of the
magnitude, the pulse direction, and the activity factor (AF) of the incident waveform. Permanent
damage to the processor is the likely result of excessive overshoot/undershoot.
Figure 13. Low-to-High System Bus Receiver Ringback Tolerance
GTLREF
V
CC
Noise Margin
+100 mV
-100 mV
V
SS
Figure 14. High-to-Low System Bus Receiver Ringback Tolerance
GTLREF
V
CC
Noise Margin
+100 mV
-100 mV
V
SS