[802.3_B400G_ELEC] Topic: Floating taps for Rx FFE

[Richard Mellitz <000014533bad0b9c-dmarc-request@xxxxxxxxxxxxxxxxx>]

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

 

Richard Mellitz

Samtec Southeast

Office: 803-908-4411

www.samtec.com

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