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print result of nios ii custum instruction on model sim?

Honored Contributor II


I add sqrt as custom instructio to nios ii and generate built system in sopc and all things ok. 

I write simple code in nios2 ide and simulate it with modelsim but not any result show . 

print NaN or 0.0000!!! 

How can i solve this problem? 

quartus 9.0 and modelsim 6.4a and niosii9 ide used. 

Thank you
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