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Re: [Discuss-gnuradio] About clock rate of USRP E100

From: Miok Wah
Subject: Re: [Discuss-gnuradio] About clock rate of USRP E100
Date: Tue, 11 Jan 2011 12:35:32 -0800 (PST)

Hi Philip,

Thanks a lot for your kind help!

>From the description here:

I see that it's possible to change the operating frequency of the OMAP using
certain commands. 

Do you know if E100 supports such commands?

Thanks again!

Philip Balister wrote:
> There are two clock rates to consider: there is the fpga clock rate 
> which is settable via uhd. I'm not good enough at fpga's to know how 
> much power can be saved this way.
> The OMAP3 clock circuitry allows sections of the OMAP to be turned off, 
> or clocked at lower rates to save power. This is how they use this chip 
> in mobile devices. That said, the kernel and user space provided with 
> the E100 has the clock rate set to the max possible and does not take 
> advantage of the OMAP power saving features. It should be possible to do 
> work in this area with the E100 though. There is lots of activity on the 
> linux-omap kernel mailing list in the power management area.
> Philip

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