Hi, On Mon, Jan 10, 2011 at 23:03, Philip Balister <phi...@balister.org> wrote: > On 01/10/2011 09:25 AM, Miok Wah wrote: >> We are planning to do some experiments with USRP E100. One advantage of >> E100 >> that we are excited with is that >> "The user can choose (at run time) a convenient clock rate". >> >> Our question is: >> 1) When we change the clock rate changed, is the main clock rate changed, >> or >> is it just change in the decimation rate? >> We are asking this because we are interested in the energy consumption of >> USRP E100. The energy consumption is likely to be reduced if the main >> clock >> rate is reduced, but unlikely to be reduced if it's just change in >> decimation rate. > > 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.
What about ADC/DAC clock rates? -- Regards, Alexander Chemeris. http://www.fairwaves.ru _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
