How to build a carry-chain in Quartus II fitter instead of using LUTs?

Hi,

In the verilog code, I think you have to connect dataa and datab to input ports instead of constant 1'b1 / 1'b0. If connect to input ports you'll get map viewer result like below pic:

For example, taking single lpm_add_sub megafunction original map viewer result, the result like pic below:

If connect lpm_add_sub megafunction dataa and datab to constant, you'll get the result like below pic instead:

Thanks,

Best Regards,

Sheng

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