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Re: [Discuss-gnuradio] USRP2 backward compatibility questions
From: |
Chris Stankevitz |
Subject: |
Re: [Discuss-gnuradio] USRP2 backward compatibility questions |
Date: |
Thu, 06 Nov 2008 18:39:47 -0800 |
User-agent: |
Thunderbird 2.0.0.17 (X11/20081104) |
Chris Stankevitz wrote:
> 5. My application requires the USRP to use the external clock provided
> by my front end. It runs at 64 MHz. Will the USRP2 accept this 64 MHz
> clock? (I'm guessing not since it appears the USRP2 runs at a different
> frequency). I can provide a sine or square wave clock.
Yes. From the FAQ (http://www.gnuradio.org/trac/wiki/USRP2GenFAQ):
Does the external frequency reference have to be 10 MHz? Can I use 100 MHz?
Actually, you can use 100 MHz as well, you will just need to change one
line of the firmware to set the R-divider on the PLL. You can use any
frequency for which the following equation has a solution:
100 MHz / N = Ref / R
for which N and R are integers and smaller than 32,768