Comparator- something wrong

[sridar]

Comparator- More LUTs,why?

Hi everyone,

I am using the following code for counter. as for me, it should occupy only 32 LUTs for inferring integer counter and the output should be mapped to routing channels. i don't know why it infers 64 LUTs. can any of you explain me.

Entity Comparator_less is

Port ( Data1,Data2 : in Integer;
d : out Integer;


End Comparator_less;

Architecture Behavioral of Comparator_less is

Begin

d <= Data1 when Data1 < Data2 else Data2;

End Behavioral;

 

[jeppe]

Hi
This example based @ a 2x4 bit data structure in order to simplify.
Please note that 3 LUTs used for the compare and 4 LUTs used for multiplexers.

No wonder this will take 64 LUTs in your example - hope this usefull
Your welcome
Jeppe