[SI-LIST] Re: Non monotonicity in daisy chain topology
- From: <mohan.sithinathan@xxxxxxxxx>
- To: <vani.chandrasekharan@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 27 Apr 2006 16:37:46 +0530
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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