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Re: [Discuss-gnuradio] About clock rate of USRP E100
From: |
Alexander Chemeris |
Subject: |
Re: [Discuss-gnuradio] About clock rate of USRP E100 |
Date: |
Tue, 11 Jan 2011 23:13:21 +0300 |
Hi,
On Mon, Jan 10, 2011 at 23:03, Philip Balister <address@hidden> 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] About clock rate of USRP E100, Miok Wah, 2011/01/10
- Re: [Discuss-gnuradio] About clock rate of USRP E100, Philip Balister, 2011/01/10
- Re: [Discuss-gnuradio] About clock rate of USRP E100,
Alexander Chemeris <=
- Re: [Discuss-gnuradio] About clock rate of USRP E100, Miok Wah, 2011/01/11
- Re: [Discuss-gnuradio] About clock rate of USRP E100, Matt Ettus, 2011/01/11
- Re: [Discuss-gnuradio] About clock rate of USRP E100, Miok Wah, 2011/01/11
- Re: [Discuss-gnuradio] About clock rate of USRP E100, Josh Blum, 2011/01/20
- Re: [Discuss-gnuradio] About clock rate of USRP E100, Miok Wah, 2011/01/24
- Re: [Discuss-gnuradio] About clock rate of USRP E100, Alexander Chemeris, 2011/01/12
- Re: [Discuss-gnuradio] About clock rate of USRP E100, Matt Ettus, 2011/01/13
- Re: [Discuss-gnuradio] About clock rate of USRP E100, Marcus D. Leech, 2011/01/11
Re: [Discuss-gnuradio] About clock rate of USRP E100, Miok Wah, 2011/01/11