On 02/08/2012 05:30 AM, Werner Almesberger wrote:
s1, let's connect J17.HPD pin to one un-used pin on fpga directly.
I'd add a series resistor, since I don't think the FPGA's pins
are 5 V tolerant,
A series resistor alone is not enough, there are no clamp diodes to
VCCIO in the FPGA. We should add one, or even better, send that signal
through some buffer (2N7002, gate, ...).
Also, VD1 on http://www.dzsc.com/data/html/2009-6-15/76847.html
looks like a good idea. Else, a monitor might even reverse-feed
the entire M1.
On the other hand, this is overkill.
S.
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