[SI-LIST] Re: S-Parameter view for multiDrop bus
- From: Hermann Ruckerbauer <Hermann.Ruckerbauer@xxxxxxxxxxxxx>
- To: olaney@xxxxxxxxx
- Date: Thu, 11 Dec 2014 19:10:59 +0100
HI Orin,
I agree that time domain is one solution. I did optimization in the past
by trying to optimize the pulse/step response.
Nevertheless I like frequency domain view for normal P2P channel
characterization and I'm still looking for a solution to do this also
for multidrop problems ...
Hermann
EKH - EyeKnowHow
Hermann Ruckerbauer
www.EyeKnowHow.de
Hermann.Ruckerbauer@xxxxxxxxxxxxx
Itzlinger Strasse 21a
94469 Deggendorf
Tel.: +49 (0)991 / 29 69 29 05
Mobile: +49 (0)176 / 787 787 77
Fax: +49 (0)3212 / 121 9008
Am 11.12.2014 um 18:52 schrieb Orin Laney:
> This is a problem best viewed and interpreted in the time domain.
>
> Orin
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of Hermann Ruckerbauer
> Sent: Thursday, December 11, 2014 1:46 AM
> Cc: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] S-Parameter view for multiDrop bus
>
> Hello Experts,
>
> I struggeled with this one several times in the past and maybe somebody has
> some answers ..
>
> Even with todays standards that go P2P serial there are still some multidrop
> things out there.
> The flyby bus of DDR3/4 is one example.
>
> I often use S-Parameter e. g. in order to check behavior of a transmission
> path, but for multidrop configuration this is difficult.
> Generated are these S-parameters usually having a port on each position of
> the DRAMs. This allows to use the model for simulation.
> But when looking to the S-parameters in a viewer they are diffictult to
> interprete, as these multiple terminations are not the normal usage case.
> In the real application you have a driver where you can place a port, but
> the termination is at the end of the bus.
> So the closest I can get there is to re-simulate have in a port at the
> driver and one DRAM. But these S-parameters do have still 3 terminations in
> and so if I view them they are still different to the real world
> application.
> And i need to generate data for each of the DRAM positions separately what I
> don't like.
>
> Does anybody have a nice solution how to display/transform the data in order
> to get a reasonable view of the transmition behavior to each of the DRAMS ?
>
> Maybe Touchstone 2.0 would be an option ..
> This allows multiple Reference Resistance values, so placing a 10k port at
> each of the DRAM positions looks like a possible solution.
> But my first trials with different port impdeances did not result in
> reasonable results .. (not sure why) ...
>
> Any idea on this one ?
>
> thanks and regards
>
> Hermann
>
> EKH - EyeKnowHow
> Hermann Ruckerbauer
> www.EyeKnowHow.de
> Hermann.Ruckerbauer@xxxxxxxxxxxxx
> Itzlinger Strasse 21a
> 94469 Deggendorf
> Tel.: +49 (0)991 / 29 69 29 05
> Mobile: +49 (0)176 / 787 787 77
> Fax: +49 (0)3212 / 121 9008
>
>
>
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