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[802.3ae] XGMII output load requirements

Dear Editor,

I am wondering about the output load requirements for the XGMII output 
buffers.  According to IEEE Draft P802.3ae/D3.1 section 46.4, an output 
impedance greater than 38 ohms is required along with a capacitive load 
of 10 pF.  These two figures give me a time constant of  380 ps.  Could 
you please let me know if this is the correct interpretation of the 

Thank you for your attention.


Iliana Fujimori
Design Engineer
Silicon Laboratories
(603)891-3650 x 17