On Wed, Jan 20, 2016 at 10:13:33PM +0100, Richard Cochran wrote:
> Rich Schmidt sent me this photo he had already made.
> 
>   http://linuxptp.sourceforge.net/i210/i210-SDPs.jpg
> 
> The "Software Defined Pins" (SDP) are on the right side of the 6 pin
> header.  On the left side you have one 3.3V pin and two ground pins.
> 
> The signal level is CMOS, and there is no ESD protection at all.
> Be careful!

Great, thanks for the information. I'll see if I can get an i210 and
connect a GPS PPS signal to it. The PPS is at the TTL level so I guess
I just need a voltage divider.

-- 
Miroslav Lichvar

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