Intel C2550 FH8065401488912 数据表
产品代码
FH8065401488912
Intel
®
Atom™ Processor C2000 Product Family for Microserver
September 2014
Datasheet, Vol. 3 of 3
Order Number: 330061-002US
639
Volume 3—Signal Electrical and Timing Characteristics—C2000 Product Family
DDR3 Memory Interface
33.1.4
DDR3 Signal Quality Specifications
Various scenarios for the DDR3 Signals have been simulated to generate a set of layout
guidelines which are available in the Intel
®
Atom™ Processor C2000 Product Family
Platform Design Guide (PDG).
Overshoot (or undershoot) is the absolute value of the maximum voltage above or
below V
SS
. The overshoot/undershoot specifications limit transitions beyond specified
maximum voltages or V
SS
due to the fast signal edge rates. The processor can be
damaged by single and/or 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). Baseboard designs which meet signal integrity and timing requirements and
which do not exceed the maximum overshoot or undershoot limits listed in
ensures reliable I/O performance for the lifetime of the processor.
33.1.4.1
Overshoot/Undershoot Magnitude
Magnitude describes the maximum potential difference between a signal and its voltage
reference level. For the processor, both are referenced to V
SS
. It is important to note
that the overshoot and undershoot conditions are separate and their impact must be
determined independently.
The pulse magnitude and duration must be used to determine if the overshoot/
undershoot pulse is within specifications.