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FP_SINCOS core bug

Altera_Forum
Honored Contributor II
‎11-21-2011 07:51 PM
1,117 Views

I am currently using the FP_SINCOS core and found some issues with the results. When configured as a cosine function it acts fine, however when It is configured to implement the sine function there are certain angles that do not produce the correct result. 

 

Example: When I feed the core with angle 7pi/6(x"406A927F") or 210 degrees it will calculate -.25(x"BE800000") instead of -.5(x"BF000000), I have seen this only with certain angles only, making me think there is a bug with the internal LUTs.  

 

Has anyone experienced this bug? 

I have attached a simulation capture of the BUG
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