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KarelSterckx's avatar
KarelSterckx
Icon for Occasional Contributor rankOccasional Contributor
2 years ago
Solved

Syntax error in initial block

I am using Quartus Prime Lite Edition v22.1.1

In my Verilog HDL code, I include the following initial block:

initial begin
div = 4’b0;
lpc = 4’b0;
pa = 4’b0;
plc_lsb = 8’b0;
plc_usb = 8’b0;
dsb = 9’b0;
end

A syntax error in every line of the initial block is generated when I compile the code. I do not see anything wrong with the code though.

  • KarelSterckx's avatar
    KarelSterckx
    2 years ago

    Thanks a lot. That is indeed the problem. I have no idea how that back tick crept in as I do not have it on my keyboard. Perhaps I copied it from somewhere though I cannot remember.

6 Replies

  • _AK6DN_'s avatar
    _AK6DN_
    Icon for Frequent Contributor rankFrequent Contributor
    2 years ago

    You need to provide more info.

    What exactly is the error message(s) that are being generated?

    What is the code context of the initial block (ie, the verilog code before the block).

    Guessing it could be the initial block is not valid in that context, or the items you assign in the block are not reg variables.

    • KarelSterckx's avatar
      KarelSterckx
      Icon for Occasional Contributor rankOccasional Contributor
      2 years ago

      The error messages for each line within the initial block are:
      Error (10170): Verilog HDL syntax error at dsb.v(10) near text: . Check for and fix any syntax errors that appear immediately before or at the specified keyword.
      Error (10170): Verilog HDL syntax error at dsb.v(10) near text: " "; expecting ";". Check for and fix any syntax errors that appear immediately before or at the specified keyword.

      Code before the initial block is:
      module dsb (clk_c, plc_lsb, plc_usb, dsb);
      input clk_c;
      output plc_lsb, plc_usb, dsb;
      reg [3:0] div, lpc, pa; // div = counter used to obtain clk_m from clk_c
      wire [3:0]sub, add;
      reg [7:0] plc_lsb, plc_usb;
      reg [8:0] dsb;

      initial begin
      div = 4’b0;
      lpc = 4’b0;
      pa = 4’b0;
      plc_lsb = 8’b0;
      plc_usb = 8’b0;
      dsb = 9’b0;
      end

  • _AK6DN_'s avatar
    _AK6DN_
    Icon for Frequent Contributor rankFrequent Contributor
    2 years ago

    Ok, I think I found the problem.

    I copied your code via cut/paste and it barfs when I compile.

    It appears in your constants in the initial block you used a unicode apostrophe character instead of a single ascii apostrophe (').

    At least that is what I got when I did a cut/paste of your code verbatim.

    Once I went in and edited the constants to use a single ascii apostrophe (ie, like 4'b0) it compiled Ok.

    foo.c is your code. The apostrophe character in the constants is '342 200 231' instead of the single ascii apostrophe (') in the edited code bar.c.

    par[533] od -c foo.v
0000000   i   n   i   t   i   a   l       b   e   g   i   n  \r  \n   d
0000020   i   v       =       4 342 200 231   b   0   ;  \r  \n   l   p
0000040   c       =       4 342 200 231   b   0   ;  \r  \n   p   a
0000060   =       4 342 200 231   b   0   ;  \r  \n   p   l   c   _   l
0000100   s   b       =       8 342 200 231   b   0   ;  \r  \n   p   l
0000120   c   _   u   s   b       =       8 342 200 231   b   0   ;  \r
0000140  \n   d   s   b       =       9 342 200 231   b   0   ;  \r  \n
0000160   e   n   d  \r  \n
0000165
par[536]
par[536] od -c bar.v
0000000   i   n   i   t   i   a   l       b   e   g   i   n  \r  \n   d
0000020   i   v       =       4   '   b   0   ;  \r  \n   l   p   c
0000040   =       4   '   b   0   ;  \r  \n   p   a       =       4   '
0000060   b   0   ;  \r  \n   p   l   c   _   l   s   b       =       8
0000100   '   b   0   ;  \r  \n   p   l   c   _   u   s   b       =
0000120   8   '   b   0   ;  \r  \n   d   s   b       =       9   '   b
0000140   0   ;  \r  \n   e   n   d  \r  \n
    • KarelSterckx's avatar
      KarelSterckx
      Icon for Occasional Contributor rankOccasional Contributor
      2 years ago

      Thanks a lot. That is indeed the problem. I have no idea how that back tick crept in as I do not have it on my keyboard. Perhaps I copied it from somewhere though I cannot remember.

  • SyafieqS's avatar
    SyafieqS
    Icon for Super Contributor rankSuper Contributor
    2 years ago

    As we do not receive any response from you on the previous question/reply/answer that we have provided. Please login to ‘https://supporttickets.intel.com’, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.


    p/s: If any answer from community or Intel support are helpful, please feel free to mark as solution, give Kudos and rate 5/5 survey