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Re: [Patch-gnuradio] FPGA clock frequency option for

From: Eric Blossom
Subject: Re: [Patch-gnuradio] FPGA clock frequency option for
Date: Fri, 12 Feb 2010 15:53:17 -0800
User-agent: Mutt/1.5.20 (2009-08-17)

On Sat, Feb 13, 2010 at 02:38:26AM +0300, Alexander Chemeris wrote:
> Hi Eric,
> On Sat, Feb 13, 2010 at 02:29, Eric Blossom <address@hidden> wrote:
> > I think a better fix would be to burn the frequency into the
> > motherboard flash on the USRP, then the host could query it.  If the
> > usrp didn't have a valid value stored, the host would assume the
> > default 64MHz.
> Is it possible to reflash it quickly then? With our ClockTamers you can
> change frequency even in real-time, without stopping USRP.

I don't think you'd wants to reflash the frequently.  I was thinking
of a one time change.

In general, I was thinking that instead of changing all the apps in
the world to support the option, you'd want to store the fpga clock
rate in a single place.  Another way to get the info is to use an
environment variable.  This does have the disadvantage that it's not
directly correlated to the USRP that you're using.  (This might matter
if you had two usrps, one with modidified clock and one without.)


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