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

  • From: "Ransom Stephens" <ransom@xxxxxxxxxxxxxxxx>
  • To: <si-list@xxxxxxxxxxxxx>
  • Date: Tue, 2 Sep 2014 15:25:24 -0700

Hey everyone,

In case you're wondering about the man behind the SI-genius of Steve Weir,
link to the interview:
http://www.edn.com/electronics-blogs/eye-on-standards/4433492/The-EE-consult
ant-who-despises-engineering-fraud 

and if you're thinking about ditching The Man and going it on your own,
Steve shared some tips on being an EE consultant: 
http://www.edn.com/electronics-blogs/eye-on-standards/4433891/10-tips-on-bei
ng-a-consultant- 

I hope you've enjoyed your summer, because it's pretty much wrapped up!
Ransom
_____________________________
Ransom W. Stephens, Ph.D.
Science & Technology - Content & Analysis

www.ransomsnotes.com
Twitting @ransomstephens
LinkedIn, Facebook and all that stuff

> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of steve weir
> Sent: Tuesday, September 02, 2014 1:23 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Default tap settings for SerDes
> 
> 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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> 
> 
> --
> Steve Weir
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