How to use carry_sum?

Question

Hi all,I am trying to use carry_sum to generate carry chains for quite some time now, mostly without luck (MAX 10). I think I might have fundamentally misunderstood how to use it. If I instanciate several entities of carry_sum and create signals that are the 'cout' output of an entity and the 'cin' of the following one, Quartus just ignores them. Can someone give me a short example on how to use it?Best regards,Max

syafieqs · Answer

Hi,The coutport of the primitive acts as the carry-in for the next element of the carry chain. To use carry_sum primitive, there are few rules you need to consider before using it refer to link below.https://www.intel.com/content/www/us/en/programmable/quartushelp/13.0/mergedProjects/hdl/prim/prim_file_carry_sum.htm1,  Verilog HDL example of a CARRY_SUM primitive instantiation.carry_sum &lt;instance_name&gt; (.sin(&lt;input_wire1&gt;), .cin(&lt;input_wire2&gt;),   .sout(&lt;output_wire1&gt;), .cout(&lt;output_wire2&gt;));Thanks,Regards

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How to use carry_sum?

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