Re: [Discuss-gnuradio] FPGA Modifications for a Continuous Carrier?

[Michael P Buettner]

> > looked at a number of examples that have no overruns using the normal .rbf 
> > file, and when I swap in my .rbf the continuous overruns invariably result. 
> > It appears that no data is arriving at the host, and the received samples 
> > are stopped completely somewhere.
> >
> >   Does anyone have any insight as to why this would be happening? The only 
> > change I have made is that I now send something non-zero when the tx fifo is 
> > empty. I would expect the transmit and receive chain to be relatively 
> > separate. Particularly as I am using two daughterboards on one USRP, one is 
> > transmitting and one is receiving.
> >
> >   Any insights or advice?  Thanks.
> >
> >   Michael
> >
> >
> >
> >
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> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

 I seem to have jumped the gun a bit. I have the overrun problem whenever I 
build the bit file.

Using the "std_2rxhb_2tx.rbf" file distributed with GSR, all is well. When I build my own 
.rbf using Quartus II 7.1 Web Edition, I have the underrun problem.  I am using a fresh SVN check 
out, and in the config.vh file for usrp_std the "common_config_2rxhb_2tx.vh" line is 
uncommented.

   Has anyone else had this problem?  When building from usrp_std.v should I expect to 
get the same .rbf as "std_2rxhb_2tx.rbf"? Maybe I am missing something...

  Any help would be appreciate.

  michael