Simulink HDL Coder complex conjugate

Karen Stephen

2019 9 21

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In Simulink HDL Coder, is there a symbol or attribute to indicate complex conjugate?

I have 2 complex signals going into a multiplier, is there a way to indicate that the 2nd signal should be conjugated?

Ideally, it would generate no extra logic, just propagate forward to swap the add/subtract operations.

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Walter Roberson 2019-9-21

https://www.mathworks.com/help/simulink/slref/mathfunction.html

"Math block" with 'conj' as the operation.

There is no attribute or parameter modification the way you would hope there to be.

Karen Stephen 2019-9-23

Thanks, Walter.

Sadly, it does not appear to propagate forward as I had hoped. HDL Coder generates a two's complement negation, but I was hoping it would swap the add/subtract operations in the complex multiply so that the Xilinx synthesizer could absorb it into DSP48's with no extra logic.

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