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Altera_Forum's avatar
Altera_Forum
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13 years ago

Case don't care statement won't work

Hello, I am wondering why I am getting an error when using a don't care statement in a case. Here is a portion of the code: when "1000--" => add_bus_out0 <= a_bus_in; add_bus_out1 <= b_bus_in; ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

--- Quote Start ---

Case with don't care does work in Quartus 12. The warning suggests that you forget to write case? instead of case. 

case? request is
when "1---" => grant <= "1000";
when "01--" => grant <= "0100";
when "001-" => grant <= "0010";
when "0001" => grant <= "0001";
when others => grant <= "0000";
end case?;

--- Quote End ---

Ok I will try that out. The only issue is that I am using Quartus 11.1 currently, but I will figure out soon if it matters.