Re: XAUI IO specs
Mike,
On your P.S., I was referencing slide 13 from the proposal authored by Mr. Ali
Ghiasi and Mr. Richard Dugan presented at the November '99 HSSG meeting in
Kauai, HI:
http://grouper.ieee.org/groups/802/3/10G_study/public/nov99/ghiasi_1_1199.pdf
The legends on the Y-axis come from the table on slide 5. Note the reference to
0V, or ground on slide 13.
Best Regards,
Rich
--
Mike Jenkins wrote:
>
> ps: On rereading Rich's note, if by "positive differential signal"
> he meant the difference of two signals, then his description
> is the same as mine (but then "referenced to ground" is
> confusing, because only single-ended signals are referenced
> to anything -- dif'l signals are referenced to each other).
> This is the type of confusion that haunts anyone specifying
> dif'l signals unless everyone is brutally unambiguous.
>
> Rich Taborek wrote:
> >
> > Mark,
> >
> > I'll have to defer to Mr. Ali Ghiasi and Mr. Richard Dugan on this issue to
> > properly resolve the nomenclature. My understanding of the parameters listed is
> > as follows using Vo Dif(max) 800 mV as an example:
> >
> > When the Output is set to a logic one, the positive differential signal,
> > referenced to a 0 V ground, is a maximum of +400 mV and the negtive differential
> > signal, referenced to a 0 V ground, is a maximum of -400 mV.
> >
> > When the Output is set to a logic zero, the positive differential signal,
> > referenced to a 0 V ground, is a maximum of -400 mV and the negtive differential
> > signal, referenced to a 0 V ground, is a maximum of +400 mV.
> >
> > I'd call this V diff peak-to-peak, but this I'm NOT an expert in this area.
> >
> > Best Regards,
> > Rich
> >
> > --
> >
> > Mark Kerestes wrote:
> > >
> > > Rich, Ali
> > > On slide 22 of the XAUI/XGXS Proposal from Albuquerque was listed :
> > > Vo Dif(max) 800mV
> > > Vo Dif(min) 500mV
> > > Vin Dif(max) 1000mV
> > > Vin Dif(min) 175mV
> > > I assume these are truely Vdif and NOT Vdif peak to peak? I have some
> > > confusion from looking back at the
> > > Nov 5 1999 "HARI the Electrical Interface" which seems to have a table
> > > that mixes Vdif and Vdif peak to peak
> > > showing PECL vs LVDS vs HARI side by side.
> > > Best regards,
> > > Mark
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