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EKuzn5's avatar
EKuzn5
Icon for New Contributor rankNew Contributor
7 years ago

"case statement choices must cover all possible values of expression."

I am attempting to build the project 'qts_ddr4_x72_1200MHz' that is included in the download for the Arria 10 GX Dev Kit, using Quartus Pro 18.1 on Linux.

It fails at the synthesis stage with the following error:

Error(13630): VHDL Case Statement error at product_info.vhd(51): case statement choices must cover all possible values of expression. 'Others' clause is needed.

Here product_info.vhd is part of Platform Designer instantiated IP that is included in the project.

The weirdest part is that, as far as I can tell (I'm not familiar with VHDL), all possible values _are_ covered. The relevant code is:

av_address : in std_logic_vector(1 downto 0);

...

case av_address is

when "00" => av_data_read <= product;

when "01" => av_data_read <= board;

when "10" => av_data_read <= sof;

when "11" => av_data_read <= version;

end case;

I saw this with 18.1.0.222 and with 18.1.2.277. It looks like a bug to me. Any ideas?

2 Replies

  • sstrell's avatar
    sstrell
    Icon for Super Contributor rankSuper Contributor
    7 years ago

    With VHDL std_logic_vector type, there are other levels besides 0 and 1, mostly used for simulation.

    I'm guessing that the code included in the download for the dev kit is from an older version of the software. Pro edition synthesis is stricter than the standard edition on certain things and this might be part of that if this older code was designed for Standard edition (Arria 10 is the only device family supported in both Standard and Pro). You could either try editing the code (when OTHERS => av_data_read <= product;) or try compiling in the Standard edition of the software.

  • EKuzn5's avatar
    EKuzn5
    Icon for New Contributor rankNew Contributor
    7 years ago

    Yes, that edit takes care of the error, thanks.