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Re: 16-bit 625Mbaud XGMII



Jaimie: you need to count package pins, not signal I/Os.

Your 625 MHz XGMII using LVDS differential signalling
requires 76 pins, which is the same pincost as the
312.5 MHz XGMII using single-ended drivers. 

In addition, you would need to run at least part of
your logic at the 625 MHz which is significantly 
more difficult to implement than staying with a
clock frequency of 312.5 MHz.