[Discuss-gnuradio] dboard lock detect bit?

[George Nychis]

Hi all,

I was wondering what the lock detect bit actually is:
http://gnuradio.org/trac/browser/gnuradio/trunk/gr-usrp/src/db_flexrf.py#L133

In the C++ tuning code that I have, sometimes when trying to initialize 
the board, I find that the bit is 0, then I do what it does and try 
again, and I find it's still 9 and so I exit.  I often have to unplug 
the board to get it to unset.

What exactly is the bit?  I can obviously read the comment "the value of 
the VCO/PLL lock detect bit" ... but I don't understand exactly what 
that is :)

Thanks!
George