The 5V is fine (maybe a little spike of 0.8V after 60 ms PS).
However, the 3.3V gives a strange 2-stage powerup cycle. I compared a
revision A5C to a revision A6, see plots below.
As can be seen the A5C has a 'normal ' powerup cycle on the 3.3V, but the
A6 a 2-stage powerup cycle. May this cause any problems with PHY?
<https://lh6.googleusercontent.com/-oYQffwcsuTE/Uyrx4haRJUI/AAAAAAAACC8/cW3xQual_Q8/s1600/20140320_143534.jpg>
<https://lh3.googleusercontent.com/-_veLX8dOp6w/Uyrx2A6EsRI/AAAAAAAACC0/fOMrXaeqSfE/s1600/20140320_142321.jpg>
On Thursday, March 20, 2014 2:44:33 PM UTC+1, c...@isbd.net wrote:
>
> Robert Nelson <robert...@gmail.com <javascript:>> wrote:
> > On Thu, Mar 20, 2014 at 4:48 AM, Kees k <keeskwe...@gmail.com<javascript:>>
>
> > wrote:
> > > I have seen this problem repeatedly by A6 revision hardware, but not
> with
> > > revision A5C hardware (I am running exactly the same software on
> both).
> > >
> > > Noteworthy is that the "PHY problem" only appears when powering the
> BBB via
> > > the headers. Powering via USB does not give any problems.
> >
> > Well, if it works via USB, but not with the headers. (I didn't check
> > if the Ethernet can be powered from the headers.)
> >
> I'm powering my BBB using P9 pins 1/2 for 0v and 5/6 for +5v, I'm
> using the 'real' ethernet connection and it works fine. It has run
> with no problems for at least 24 hours, staying connected (ssh) to my
> desktop computer.
>
> --
> Chris Green
> ยท
>
>
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