NU1S114-434  ->
http://www.bothhandusa.com/products/rj45/NU1S114-434-RevA2-021210.pdf

I ordered EASY ETHERNET CS8900A from EDTP ( www.edtp.com ). Board has
CS8900A, PIC18F452, NU1S114-434 and some I/O ports.
I plugged it to power. It worked fine. But then after I reprogrammed it
several times using Microchip's PM3 it stopped working.
PIC does work. I checked it.
I think that the problem is either with CS8900A ( but as many say it's the
last place I should be looking at ) or the transformer integrated with
RJ45 -> NU1S114-434. I sent e-mail to EDTP and they told me that they had
never had any broken board before.
Why do I think is broken?
When I plug in Ethernet cable the link diode doesn't lit. I tried
cross-over cable and tried connecting it to hub. Doesn't work. I even took
out PIC from socket. The same. Cirrus ( manufacturer of CS8900A ) says
that if LED is not on after you plug in Ethernet cable it is hardware
problem.
It happened after I reprogrammed PIC. Did anybody experience something
like that before? Can programming voltage damage CS8900A or transformer?
If not what could be the reason of that?

Thank you,
Sam



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