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eunchong
Visitor
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Registered: ‎07-16-2017

BER and EYE SCAN in iBERT

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We are using IBERT IP to calculate BER and scan an EYE SCAN. We have 1 question:

 

How FPGA board know a differential signal is 0 or 1?  Does FPGA tune automatically for reading a differential signal? In other words, which (X, Y) point in EYE SCAN’s result use when FPGA define a differential signal is 0 or 1 in real time?

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hpoetzl
Voyager
Voyager
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Registered: ‎06-24-2013

Hey @eunchong,

 

How FPGA board know a differential signal is 0 or 1?

A differential signal comes in as _P and _N and when _P is larger than _N (by a certain amount) it will be considered a '1' and when _N is larger than _P (usually by the same amount) then it will be considered a '0'.

 

Note that for the Eye Scan, this is not really relevant as it only checks for differences between the received and scanned signal (which is taken at an horizontal and vertical offset).

 

Hope this helps,

Herbert

-------------- Yes, I do this for fun!

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hpoetzl
Voyager
Voyager
2,604 Views
Registered: ‎06-24-2013

Hey @eunchong,

 

How FPGA board know a differential signal is 0 or 1?

A differential signal comes in as _P and _N and when _P is larger than _N (by a certain amount) it will be considered a '1' and when _N is larger than _P (usually by the same amount) then it will be considered a '0'.

 

Note that for the Eye Scan, this is not really relevant as it only checks for differences between the received and scanned signal (which is taken at an horizontal and vertical offset).

 

Hope this helps,

Herbert

-------------- Yes, I do this for fun!

View solution in original post

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