Intel E5-1428L CM8062001144000 Datenbogen

The overshoot/undershoot specification for the processor is not a simple single value.

Instead, many factors are needed to determine the over/undershoot specification. In

addition to the magnitude of the overshoot, the following parameters must also be

known: the width of the overshoot and the activity factor (AF). To determine the

allowed overshoot for a particular overshoot event, the following must be done:
1. Determine the signal group a particular signal falls into.
2. Determine the magnitude of the overshoot or the undershoot (relative to VSS).
3. Determine the activity factor (How often does this overshoot occur?).
4. Next, from the appropriate specification table, determine the maximum pulse

duration (in nanoseconds) allowed.

5. Compare the specified maximum pulse duration to the signal being measured. If

the pulse duration measured is less than the pulse duration shown in the table,

then the signal meets the specifications.

Undershoot events must be analyzed separately from overshoot events as they are

mutually exclusive.

The overshoot/undershoot specifications listed in the table specify the allowable

overshoot/undershoot for a single overshoot/undershoot event. However most

systems will have multiple overshoot and/or undershoot events that each have their

own set of parameters (duration, AF and magnitude). While each overshoot on its own

may meet the overshoot specification, when you add the total impact of all overshoot

events, the system may fail. A guideline to ensure a system passes the overshoot and

undershoot specifications is shown below.
1. If only one overshoot/undershoot event magnitude occurs, ensure it meets the

over/undershoot specifications in the following tables, OR

2. If multiple overshoots and/or multiple undershoots occur, measure the worst case

pulse duration for each magnitude and compare the results against the AF = 0.1

specifications. If all of these worst case overshoot or undershoot events meet the

specifications (measured time < specifications) in the table (where AF= 0.1), then

the system passes.

1.3335 V

0.2835 V

3 ns

5 ns

1.2600 V

0.210 V

5 ns

5 ns

Intel

®

 Xeon

®

 Processor E5-1600 and E5-2600 v3 Product Families, Volume 1 of 2, Electrical

September 2014

Datasheet

Order No.: 330783-001

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