[SI-LIST] Re: Default tap settings for SerDes

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Tue, 02 Sep 2014 13:22:54 -0700

You may find that for consistently built short links that fixed EQ is 
fine.  And you may even find that the default coefficients are 
adequate.  But I don't know how you get there without doing the homework 
at least once.

Steve

On 9/2/2014 1:06 PM, Mario Antolos wrote:
> For SerDes transceivers with high equalization capabilites and many
> different tap combinations, when it's "good enough" to use default
> settings, instead of performing extensive optimal tap settings search?
> I know that it should boil down to how much margin (losses, receiver
> sensitivty, etc) we have, but for example in cheap consumer electronics,
> it's cheaper to have fixed default tap setting then to have programmable
> tap settings.
>
>
> Also what are default tap settings?
>
> For example in PCI Express where we have:
>
> -3.5 dB de-emphasis, for 2.5 Gbps & 5 Gbps
>
> -6.0 dB de-emphasis, for 5 Gbps
>
>
> Thanks, Mario
>
>
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