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RE: [802.3ae] XGMII output load requirements

You are working from an old draft.  The current draft is D4.2.  I will leave
interpretation of the draft to you, since a draft is subject to change.  I
don't recall in which previous draft the language around the 10 pF changed,
but I vaguely recall it changing at some point, and it now is used only in
the context of conformance testing.

Bob Grow
Chair, IEEE 802.3
(Editor, 802.3ae clause 46)

-----Original Message-----
From: Iliana Fujimori [mailto:iliana.fujimori@xxxxxxxxxx]
Sent: Monday, March 25, 2002 9:30 AM
To: stds-802-3-hssg@xxxxxxxx
Cc: Iliana Fujimori
Subject: [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