[SI-LIST] Re: Fw: HELP LVDS LINE

please use this guidelines for your board which answers ur question 1,2
(See attached file: lvdsboardwp.pdf)

umashankar
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Senior Engineer - R&D, Drives & Power Systems,
Converteam EDC Pvt Ltd, Chennai
+91-44.6611.5418


                                                                           
             steve weir                                                    
             <weirsi@xxxxxxxxx                                             
             m>                                                         To 
             Sent by:                  david stern <dan1_st@xxxxxxxxx>     
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             eelists.org               si-list <si-list@xxxxxxxxxxxxx>     
                                                                   Subject 
                                       [SI-LIST] Re: Fw: HELP LVDS LINE    
             05/25/2009 12:51                                              
             PM                                                            
                                                                           
                                                                           
                                                                           
                                                                           




David, there are multiple requirements:

* You will want to match the two signals in each pair  at a minimum to
guarantee skew does not ever exceed Tr or Tf min.
* The match between any data pair and the clock pair must be close
enough to guarantee Tsu, and Th

Steve.
david stern wrote:
>
>
>
>
>
>
> Hello
> Ihave two questions that I need help:
>
> 1)  I have 5 differential lines one of them is clock running at 60MHz.
> I am at the layout stage. the five pairs should be at the same length.
> But actually they don't have the same length. What is the maximum
difference in
> length that I can accept and how do I calculate it?
>
> 2) Those signals are deserialized into 28 lines. Are those lines should
be ROUTED with the same length? What is the maximum difference in
> length that I can accept and how do I calculate it?
>
> Thank you
>
> David
>
>
>
>
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