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veekshitha
Adventurer
Adventurer
655 Views
Registered: ‎08-13-2019

Pre-cursor and Post cursor

I wanted more input on pre cursor and post cursor in IBERT GTH transceievers.What is it?

How to we change the the pre and post cursor values and on what basis do we change?

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roym
Moderator
Moderator
585 Views
Registered: ‎07-30-2007

This is emphasis that is used to overcome intersymbol interference.  See:

https://www.xilinx.com/publications/archives/books/serialio.pdf

A good way to use it is to sweep the possible settings and use IBERT to see which setting gives the largest eye. Usually 3 or 6 dB of preemphasis will be best.

They are controlled by the TXPRECURSOR and TXPOSTCURSOR ports.

 

 

 

 

 




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