...
Sébastien> effect (beyond making the system slow). * Flaky FPGA power
Sébastien> supply: likely. At Xilinx they told me that we should use 1
Sébastien> via per power or ground pin and not share a via across
Sébastien> several pins. I checked the SP601 Gerber files and they
Sébastien> actually do that. The MM1, by contrast, does quite a lot of
Sébastien> via sharing.
I normally use two GND vias on every QFP pin and at least one for each BGA
pin. However I haven't had time to test Milkymist/LM32 on the board.
Sébastien> * Other ideas...?
What hapenens if you run a half the clock? Perhaps some timing problem?
Any hidden/forgotten clock domain crossings were you wait for that signal in
several
places and it arrives in time in one place and too late in another and the
logic stumbles on it?
Any chipscope debugging?
Sébastien> S. _______________________________________________
Sébastien> http://lists.milkymist.org/listinfo.cgi/devel-milkymist.org
Sébastien> IRC: #milkym...@freenode Webchat: www.milkymist.org/irc.html
Sébastien> Wiki: www.milkymist.org/wiki
--
Uwe Bonnes [email protected]
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
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