FreeLists / si-list / [SI-LIST] Paper on BGA crosstalk and power system (Altera Responds)

[Don & Melissa Nelson <dhwn@xxxxxxx>]

I thought that you all might be interested in reading Altera's response 
to the the recent Xilinx Webinar:
http://www.altera.com/literature/wp/signal-integrity_s2-v4.pdf

I'm hardly qualified to comment on this, but they do raise some 
interesting points.  However, they seem to be limiting their analysis 
of Xilinx to simulations (understandable, as Virtex-4s are hard to come 
by right now) and they don't comment on the i/o strength selected for 
each device.

Interestingly, they seem to confirm Xilinx's claim that the ground 
bounce can reach 300mV, but note that, for HSTL-II at least, this is 
still within the Vil allowance.

I would be very interested to hear an expert comment on the test 
methodology of this paper compared with Xilinx's, which seemed quite 
rigorous to my inexperienced eyes.

cheers,
-don
--
Don Nelson
Sr. Hardware Development Engineer
Marconi Corporation, Plc.
Pittsburgh, PA  15086
(724) 742-6044

The [United States] Constitution only gives people the right to pursue 
happiness; you have to catch it yourself.  --Ben Franklin



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