what are factor need for to design high speed design board??

[selvakumar.m]

what should be learn for moving to high speed design boards in allegro

 

[marce]

Follow some of the links below.
An understanding of TEM wave propagation helps.
Learning the tools that come with Allegro.
Most reccomend a Signal Integrity Verification add on to simulate your critical signals.


Some interesting reading and links.
"Electromagnetic Compatability Engineering" Henry Ott ISBN798-470-18930-6
"High-Speed Digital Design" Howard Johnson & Martin Graham ISBN 0-13-395724-1
"Right The First Time" Lee W. Ritchey Free Download Right the First Time

Henry Ott Consultants
Tech Tips

The EMC Compliance Club
A source of some excellent articles by Keith Armstrong and others, including a few articles on shielding audio equipement
EMC Information Centre - The EMC Journal (Free in the UK)

Signal Integrity Sites
beTheSignal.com
**broken link removed**
Speeding Edge consultants specialize in high-speed PCB and system design disciplines


A simple presentation of some of the Issues.
http://www.x2y.com/filters/TechDay0...log_Designs_Demand_GoodPCBLayouts _JohnWu.pdf

And one of my favorites:
Especially number one, regarding clocks, which will apeal to all those that instead of using the
clock or crystal next to a device on a board, add a seperate board with long leads to achieve low jitter.
The 10 Best Ways to Maximize Emission from Your Product

 

[bert_kak]

what should be learn for moving to high speed design boards in allegro

Try using the constraints in allegro. it is good for maintaining your rules in high speed design.

 

[marce]

Reading up on DDR ram requirements (1,2 and3) and the various interfacing application notes is evry usefull, as this is one (if not thee) most used high speed interface and one of the most documented.
It will help give you an idea of what you have to constrain.