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Ray I’m showing my ignorance, but I was
under the impression that LVDS used twisted pair and was not a ‘buss
friendly’ design. Multi-drop would seem logical, since folks
already have other designs in mind for buss mounted cards. Thanks Eric From:
xylo-sdr-bounces@lists.ae5k.us [mailto:xylo-sdr-bounces@lists.ae5k.us] On Behalf Of Ray Anderson At the following URLs there are Visio and JPEG
drawings of 3 common LVDS buss topologies (Point to Point, Multi-Drop,
and Multi-point) that might be found on a backplane. Each comes with it’s
own challenges and problems. http://www.hamsdr.com/dnld.aspx?id=144 (Visio format)
In the case of the Point to Point topology there is a single
driver on the buss and multiple receivers. In the Multi-Point topologies there
can be multiple drivers as well as multiple receivers. If I am interpreting the
Janus and Lionheart block diagrams correctly it seems that the currently
envisioned topology is point-to-point (Janus and Lionheart only). With the
desire for extra backplane slots it looks like Multi-Drop. Are there
applications envisioned in the future that might place multiple drivers on the
buss in the Multi-point topology? -Ray WB6TPU |