LUT_INPUT Primitive
To make a LUT, you need to use both input and output buffers that bound a cone of logic, as in the following example.
FUNCTION lut_output (in) RETURNS (out); FUNCTION lut_input (in) RETURNS (out); SUBDESIGN test ( ina : INPUT ; inb : INPUT ; inc : INPUT ; ind : INPUT ; outd : OUTPUT ; ) BEGIN outd = lut_output( lut_input (ina) & lut_input (inb) & lut_input (inc) & lut_input (ind) ) ; END ;
Note: For information about Intel® Quartus® Prime
primitive instantiation, go to Using a Intel® Quartus® Prime Logic
Function.