[SI-LIST] Re: Non monotonicity in daisy chain topology
- From: esayre3@xxxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 27 Apr 2006 07:37:17 -0700
Hello All,
The daisy chain topology is and always be an issue. Loading stub
lengths and bus impedance are the predominant effects. The daisy chain
topology, also known as Multidrop technology, is well documented at TI,
National Semiconductor, and NESA websites. There are a few white papers
out there on MLVDS and BLVDS technologies. You should also know that the
Advanced TCA backplanes have a multidrop clock architecture that is
advertised to run at 100Mbps.
Regards
-Ed Sayre 3rd
> -------- Original Message --------
> Subject: [SPAM] [SI-LIST] Re: Non monotonicity in daisy chain topology
> From: mohan.sithinathan@xxxxxxxxx
> Date: Thu, April 27, 2006 4:07 am
> To: <vani.chandrasekharan@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
>
> Hi Vani-
>
> The daisy chain with multiple loads will encounter this issue and it is
> not a good topology to use - esp for the edge sensitive signals (such as
> clock, interrupts, etc).
>
> The other topology which will avoid this would be "Rake" topology. The
> "T" and "Star" topologies can also be used based on the number of loads
> and distance. But Rake would be best of all.
>
> I tried this in my design. The Rake Topology removes the shelves on the
> edge sensitive signals (which has multiple loads).
>
> -With regards, Mohan S
>
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of vani.chandrasekharan@xxxxxxxxx
> Sent: Thursday, April 27, 2006 10:40 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Non monotonicity in daisy chain topology
>
>
>
> Hi,
>
> I observed an inevitable non monotonic behaviour in the devices which
> come first in the daisy chain after the driver.
> The subsequent devices see reduced effects of non monotonicity, the end
> device with a 10k pull down termination seems to be faring well in terms
> of signal quality. How to mitigate this behaviour, Kindly suggest some
> solutions.
>
> I referred to si-list back mails which has one such discussion on this
> issue, it states that it is a known behaviour of devices in daisy chain
> topology. But I could not find a solution to change this behaviour.
> Please advice.
>
> Thanks and warm regards
> Vani
>
>
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