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Error in Verilog AMS for decoding logic

ksnf3000

 Hello All,

I am trying to implement a decoding logic using Verilog AMS. However, I am always stuck wtih the below errors. (Screenshot 43.png)

 The code is as follows: 

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

module decode_logic_new11 (D_I,D_O);
 input   [2:0] D_I;
 electrical [2:0] D_I;

 output  [23:0] D_O;
 electrical [23:0] D_O;

 parameter real Vout;

parameter real
     Term1 = 555,Term2 = 550, Term3 = 505,Term4 = 500,Term5 = 055,Term6 = 050, Term7 = 005,Term8 = 000;

 
  parameter real   one = 5.0;
  parameter real  zero = 0.0;
  parameter real   vth = 3.0m;
  parameter real slack = 10.0p from (0:inf);
  parameter real trise = 50.0p from (0:inf);
  parameter real tfall = 50.0p from (0:inf);
  parameter real tconv = 500.0p from [0:inf);
  parameter integer traceflag = 0;

      analog begin
      @(initial_step or initial_step("dc", "ac", "tran", "xf"))  begin

        if(V(D_I[2:0]) == Term1)
    begin
         assign Vout = 000000000000000000000000;
         V(D_O[23:0]) <+ transition (Vout,tconv, trise, tfall);
    end
    if(V(D_I[2:0]) == Term2)
    begin
        Vout = 000000000000000000005555;
         V(D_O[23:0]) <+ transition (Vout,tconv, trise, tfall);
    end
     if(V(D_I[2:0]) == Term3)
    begin
         Vout = 000000000000000055555555;
         V(D_O[23:0]) <+ transition (Vout,tconv, trise, tfall);
    end
    if(V(D_I[2:0]) == Term4)
    begin
        Vout = 000000000000555555555555;
        V(D_O[23:0]) <+ transition (Vout,tconv, trise, tfall);
    end
    if(V(D_I[2:0]) == Term5)
    begin
        Vout = 000000005555555555555555;
        V(D_O[23:0]) <+ transition (Vout,tconv, trise, tfall);
    end
    if(V(D_I[2:0]) == Term6)
    begin
         Vout = 000055555555555555555555;
         V(D_O[23:0]) <+ transition (,tconv, trise, tfall);
      end
    if(V(D_I[2:0]) == Term7)
    begin
        Vout = 000055555555555555555555;
          V(D_O[23:0]) <+ transition (Vout,tconv, trise, tfall);
    end
    if(V(D_I[2:0]) == Term8)
    begin
         Vout = 000000555555555555555555;
         V(D_O[23:0]) <+ transition (,tconv, trise, tfall);
    end
    end   
end               
endmodule

Please let me know the possible reason for it and any solutions for this problem.

 Regards,

ksnf3000

  • First problem is

    "paramter real Vout"  you are missing right hand side assignment as you did while declaring  Term1 = 555,Term2 = 550 etc...

    It has to be  something like this "parameter real Vout=5.0"

     Next problem is using assign statement in analog block is not allowed.

    And third problem I see is the Vout value that was being assigned(000055555555555555555555) which I think the tool is unble to store such a big value.

     Thanks,

    Shalem

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