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problem with verifying dsp builder advanced blockset single data type on FPGA

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katayoon_1

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hello everyone
I built a simple model in dsp builder that returns the product of two constant number for example 2 by 1. I used dsp builder advanced blockset. when I set the data type in fixed point and verify the vhdl code in FPGA it works and I can see the result in signal tapII. but when I set the data type as SINGLE (floating point) the result in signal tapII is zero!!!
pleaze help me
 

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