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[802.3_B400G_ELEC] Topic: COM 4.5

I am working on aligning “178A.1.9 Application of optimized parameters” in COM. I believe COM 4.4 may not be aligned to this.

 

… Rich

 


Richard Mellitz

Samtec Southeast

Office: 803-908-4411

www.samtec.com

From: Richard Mellitz
Sent: Thursday, March 21, 2024 10:22 AM
To: STDS-802-3-B400G-ELEC@xxxxxxxxxxxxxxxxx
Subject: Topic: Floating taps for Rx FFE

 

Hi All,

 

In COM 4.4 there are 2 selections to compute the floating taps controlled by the following spreadsheet table entry

 

RXFFE FLOAT CTL

ISI

 

FOM o ISI

 

If there are 1 or 2 groups of tap the FOM method may be as good or better than the ISI method invoked respectively by functions “ findbankloc” and “ FOM_rxffe_floating_taps”.

 

However, 3 or more groups may exhibit a search blocking issue for FOM which ISI method does not have.

 

In many cases I have seen the ISI method yield a slightly better ( a few hundredths of dB)  FOM than the FOM method.

 

I was thinking of checking both methods unless someone has a better idea for the FOM method that accounts for blocking better.

 

Thoughts,

 

… Rich

 


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