Quartus Compilation error

Question

Hello,

I am getting a compilation error in Quartus II as:

error (12153): can't elaborate top-level user hierarchy

What is the possible cause?

I have an always statement in my code as below:

always @ (posedge clk or posedge reset or posedge enable)

does this creating the problem?

Please any one can help?

altera_forum · Answer

Are you sure thats the only error? Please post the full code and all errors (not just the final one).

altera_forum · Answer

Hello nazmulece08,

you should only use two posedges, clk and reset, a ff enable is not edge triggered:

reg ff;

always @ (posedge clk or posedge reset)

begin

if (reset)

begin

ff <= 1'b0;

end

else

begin

if (enable)

ff <= data;

end

But it seems that there is at least one more issue with your code.

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