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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 19:44:36 -0800 (PST) |
Hey Matt,
Thanks a lot for your help. Could you explain how to slow down the FPGA/ADC
rate? How should we modify the firmware? Which part of the code should we
look into? Thanks!
Matt Ettus wrote:
>
>
> As it is currently set up, there are only 2 clock rates. The OMAP
> processor can run at up to 720 MHz. This clock rate is independent of
> the FPGA, ADC, and DAC clocks.
>
> The ADC clock can run as high as 64 MS/s. The DAC always runs at
> exactly double the rate of the ADC. The FPGA is normally running at the
> same speed as the ADC, but you could conceivably run at 2x or 1.5x if
> you want to go faster, or a number of speeds if you want to go slower.
>
> We have not tried changing the FPGA/ADC/DAC clock during normal
> operation, but I don't think it would be worth the trouble to change it
> dynamically.
>
> Matt
>
>
--
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Re: [Discuss-gnuradio] About clock rate of USRP E100, Miok Wah, 2011/01/11