Hi, Paul, Another option would be to use the "DDS Compiler" block from system generator. That can be used to generate sin/cos signals as well. I'm not sure whether it has all the same options as the CASPER sin/cos block, but could be worth looking into.
Hope this helps, Dave On Sep 19, 2013, at 10:26 AM, Paul Marganian wrote: > Sorry Andrew, I can't seem to find any of the alternatives you recommended. > We're using xlinx 14.3, and our mlib_devel's most recent commit was May of > this year. > Thanks again, > Paul > > On 09/19/2013 11:41 AM, Paul Marganian wrote: >> Thanks Andrew, >> I'll look into those other blocks. >> The problem happens at compile time. >> Paul >> >> On 09/19/2013 09:45 AM, Andrew Martens wrote: >>> Hi Paul >>>> I've recently been having problems with the Casper DSP sincos block. I'll >>>> successfully run a number of simulations, then I start getting these >>>> errors at compile time: >>>> >>>> Error in 'test_sin/sincos1': Initialization commands cannot be evaluated >>>> Error evaluating parameter 'initVector' in 'test_sin/sincos1/rom0' >>>> Subscript indices must either be real positive integers or logicals. >>>> >>>> The only way to get away from this error seems to be shutting down both >>>> the model *and* restarting matlab again. After a few new simulations >>>> however, the problem comes back up, slowing down my workflow considerably. >>>> Any ideas? >>>> >>> Does the problem only happen at compile time or also during simulation? >>> >>> You can also try the cosin block from the Downconverter subsection. It is >>> more sophisticated in BRAM saving and is used in the FFT library for >>> coefficient generation (so should work). >>> >>> Depending on your application you may also look at using the feedback_osc >>> block which generates a cos/-sin pair using multipliers instead of using a >>> lookup table. It can only generate in-order values though, not in arbitrary >>> order as the sincos/cosin blocks do. The feedback_osc is also used in the >>> fft family so should work. >>> >>> Regards >>> Andrew >> >
