Solve the mystery...

Discussion in 'Programmer's Corner' started by naizath12, Jun 25, 2009.

  1. naizath12

    Thread Starter New Member

    Jun 25, 2009
    1
    0
    i composed the following program.


    module division_try(/*divisor,dividend,*/quotient,remainder);
    output [3:0] quotient;
    output [3:0] remainder;
    //input [3:0] divisor;
    //input [3:0] dividend;

    reg [3:0] divisor='b10; //initialise
    reg [3:0] dividend='b1010; //initalise


    reg [3:0] divisor_alias;
    initial
    divisor_alias=divisor;

    reg [3:0] quotient;
    initial
    quotient=dividend;


    reg aMSB_old;
    reg [3:0] remainder;
    reg[7:0] concat_aq;
    integer n;


    always
    begin

    for(n=0;n<4;n=n+1)
    begin
    concat_aq={remainder,quotient};
    concat_aq=concat_aq<<1;

    if(aMSB_old)
    begin
    adder4 ////ERROR HERE////////////////////////
    A1(remainder,divisor_alias,'b0,remainder);
    end

    else if(aMSB_old==0)
    begin
    sub4 /////ERROR HERE////////////////////////
    A2(remainder,divisor_alias,'b0,remainder);
    end

    aMSB_old=remainder[3];

    case (aMSB_old)
    1: quotient[0] = 0;
    0: quotient[0] = 1;
    endcase
    end

    if(aMSB_old)
    begin
    adder4 /////ERROR HERE////////////////////////
    A3(remainder,divisor,'b0,remainder);
    end

    end
    endmodule

    and when i synthesized the code(the modules for adder4 and sub4 which they themselves call another another submodule each)
    I wasnt able to synthesize
    i got the following error message

    ERROR:HDLCompilers:26 - "division.v" line 57 unexpected token: 'adder4'
    ERROR:HDLCompilers:26 - "division.v" line 63 unexpected token: 'sub4'
    ERROR:HDLCompilers:26 - "division.v" line 77 unexpected token: 'adder4'

    have i gone wrong in the flow??.....are v not supposed to use continuous statements inside a procedural block??....(in my case i have tried using assign-deassign & force-releasse also but in vain....

    can u ppl help me??...
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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