1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Verilog Program

  1. Oct 17, 2012 #1
    1. The problem statement, all variables and given/known data

    Create a circuit (a module) called ParityBuild. It takes a parameterized input that is n bits wide. The ParityBuild module then examines the input bit stream and determines the parity (use even parity). The output is a bit stream that is n+1 bits wide, with the parity bit appended as the MSB to the input stream. (Do not use any parity functions… write your own code to count the number of 1s. Is there an easy way to do this?). Simulate your design with at least three different input values to verify correct operation.

    2. Relevant equations


    3. The attempt at a solution

    When I simulate the code, I get the output to replicate the entire input, but I cant seem to add the additional digit out front. When I simulate, the most significant bit is not assigned to anything. The following is the code that I did,

    NOTE: I'm pretty sure the problem exists in line 18 and 27. The program is not assigning the bit values for what I want them to be.

    1 module ParityBuild(inputStream,outputStream);
    2 parameter n = 8;
    3 integer k;
    4 integer count = 0;
    5 input [n-1:0] inputStream;
    6 output reg [n:0] outputStream;
    8 always @(inputStream)
    9 begin
    10 for(k = 0; k < n; k = k + 1)
    11 begin
    12 if(inputStream[k] == 1'b1)
    13 count = count + 1;
    14 end
    16 if(count%2 == 0)
    17 begin
    18 outputStream[n]=1'b0;
    19 for(k = 0; k < n; k = k + 1)
    20 begin
    21 outputStream[k]=inputStream[k];
    22 end
    23 end
    25 else
    26 begin
    27 outputStream[n]=1'b1;
    28 for(k = 0; k < n; k = k + 1)
    29 begin
    30 outputStream[k]=inputStream[k];
    31 end
    32 end
    33 end
    35 endmodule
    Last edited: Oct 17, 2012
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted