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Eye diagram of transmitter pin

Question asked by ssupun90@gmail.com on May 31, 2015

Hi,

 

I simulated a differential trace in hyperlinks and got an unexpected eye diagram at the transmitter side. receiver side eye diagram is good but I could not understand why the transmitter side eye diagram looks so bad. I will attach a image of transmitter side eye diagram. I double checked the stackup and differential impedance of the two traces according to specifications of GTX transceiver module in vertex 7. Can anyone guide me to the solution ?. I'm stuck here for many days now.

            Figure 1. Fast eye viewer of transmitter side

Line sim diagram

stackup

 

Thank you.

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