The Designer's Guide Community
Forum
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Aug 1st, 2021, 11:44pm
Pages: 1 2 
Send Topic Print
Regarding eye diagram (Read 13603 times)
raja.cedt
Senior Fellow
******
Offline



Posts: 1516
Germany
Re: Regarding eye diagram
Reply #15 - Jan 10th, 2012, 12:43am
 
hello YWguo,
yes you are correct. But i guess now many standards got migrated to 66b/68b to less data rate overhead due to coding . May i know what is the main criterion behind coding selection.

Thanks,
Raj.
Back to top
 
 
View Profile WWW raja.sekhar86   IP Logged
loose-electron
Senior Fellow
******
Offline

Best Design Tool =
Capable Designers

Posts: 1638
San Diego California
Re: Regarding eye diagram
Reply #16 - Jan 10th, 2012, 3:47pm
 
raja.cedt wrote on Jan 9th, 2012, 1:28pm:
hello jerry,
if you have coding like 8b/10b in transmitter, then data has some minimum transition so whats the purpose of RLL then?

Sorry jerry, i am new to this field so i am asking this kind of basic Questions.

Thanks,
Raj.  


Not a problem Raj.

The 8b/10B is a RLL code.

Some form of binary data (aka NRZ data) with no restrictions (it
can have a million 0's in a row in it!) is put into an encoder,
which transforms it into an 8b/10b code structure which obeys
rules associated  with min-max distance between transitions.

The RLL code is transferred in the communication medium.

Reception of the RLL code is synchronized back to a clean synchronous
set of digital transitions which is tied to the receiver's CDR system.

That data goes through a decoder, which takes the 8b/10b and
converts it bake to NRZ data.

thats the basics.... Smiley
Back to top
 
 

Jerry Twomey
www.effectiveelectrons.com
Read My Electronic Design Column Here
Contract IC-PCB-System Design - Analog, Mixed Signal, RF & Medical
View Profile WWW   IP Logged
Pages: 1 2 
Send Topic Print
Copyright 2002-2021 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.