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Altera_Forum's avatar
Altera_Forum
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10 years ago

Quartus Compilation error

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 a...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

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

end

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