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Message: [QUOTE="Tricky, post: 4098810"] The function you are trying to call expects a declared object (so a signal, variable or constant). you cannot pass types into functions. you could do it with something like: constant COEFF_SIZER : coeeffiecient_type; constant a2_coeff : coeefficient_type := to_sfixed(0.724545, COEFF_SIZER); Just a quick question: are you sure you want such large coefficients and data types, and ones that dont divide by 18? Altera multipliers (and I think Xilinx too) work on 18 bit inputs (giving 36 bits results). 2x 36bit inputs eats up 4 multipliers. [/QUOTE]