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DS90UB928 - Differential Output Eye Opening width

Guru 20090 points

Hello,

Could you please let me know the meaning of Differential Output Eye Opening width?
I think that we must keep >0.4UI at the CMLOUT pin for communicating SerDes.
Is my understanding correct ?

Also, Could you please let me know the min value of Ew?
The DS90UB926-Q1 datasheet have minimal value of Ew however the DS90UB928-Q1 datasheet don't have minimal value. Typical value only.

Best Regards,
Ryuji Asaka