1Dgame/zvn.luc at main · iso2kx/1Dgame · GitHub

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module zvn (
    input x[16],
    input y[16],
    input s[16],
    input alufn[6],
    output z,
    output v,
    output n
  ) {

  always {
      case (alufn[5:0]) {
      b000000:
          z = ~|s;
          v = (x[15] & (y[15]^alufn[0]) & ~s[15]) | (~x[15] & ~(y[15]^alufn[0]) & s[15]) ;
          n = s[15];

      b000001:
          z = ~|s;
          v = (x[15] & (y[15]^alufn[0]) & ~s[15]) | (~x[15] & ~(y[15]^alufn[0]) & s[15]) ;
          n = s[15];

      b000010:
          z = ~|s;
          v = (~x[15] & y[15] & ~s[15]) | (x[15] & ~y[15] & ~s[15]) | (~x[15] & ~y[15] & s[15]) | (x[15] & y[15] & s[15]);
          n = s[15];

      default:
          z = 0;
          v = 0;
          n = 0;

        }


  }
}