Hello,

   I am quite new to VerilogA. Currently I want to read a .log file into VerilogA and use the transition filter. The file is just a lot of "0" and "1", and either "0" or "1" in each line. How can I read it correctly? I try to use fscanf(), but I get the syntax error. Could anybody help me to correct the error?

// VerilogA for VerilogA, readfile, veriloga

`include "constants.vams"
`include "disciplines.vams"

module readfile (clk, out);
 input  clk;
 output out;
 electrical out, clk;

 integer pwmfileA;
 real hold;
 real pwm_A[0:1024];
 genvar i, k=0;
 parameter real thresh=0.6;
 parameter tr=1n, tf=1n, dy=0;
 integer j=1;
 
analog begin

 @(initial_step) begin
   pwmfileA = $fopen("./pwm_A.log","r");  // here report an error
   $fclose(pwmfileA);
   end

   for (i=0; i<1024; i=i+1) begin    
     pwm_A[i] = $fscanf(pwmfileA,"%d",j);  //here report an error
     j=j+1;
   end
                 
 for (k=0;k<1024;k=k+1) begin
   @cross(V(clk)-thresh, +1)
     hold = pwmfileA[k];
     V(out) <+ 1.2*transition(hold, dy, tr, tf);
 end
end
endmodule

the reported errors are shown here:
Error found by spectre during AHDL compile.
   ERROR (VACOMP-1149):
       "./veriloga.va",
       line 26: Genvar loop evaluation failed. Check whether `/usr/bin/perl'
       is available.
   ERROR (VACOMP-1816): Exiting AHDL compilation.

   Any comments are welcome.
   Thank you.
   Jacki

Problem has been solved.

Thank you.

Geoffrey_Coram wrote on Jan 18^th, 2016, 8:08am:


Hello Geoffrey,
   Thank you very much for your reply. The problem has been solved. The reason for the slow simulation is I define a very big array, and use this array to read in the data file. This array occupies a lot of memory. If I remove this array. The speed is fine.
   By the way, do you know how to read a read starting from the middle part?
   Currently I only know to read in a file starting from the beginning.
   For example:
fileA = $fopen("./A.log","r");
$fscanf(fileA,"%b\n",hold);
   If I want to read in the data from some middle part in the file A.log, can you please suggest how I should do it?
   Thank you.

Geoffrey_Coram wrote on Jan 25^th, 2016, 7:13am:


Hi Geoffrey,

   Thank you very much. I will try it.