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//  @(#)exception.v	1.1  4/7/92
//

module Exception (BM, SNnotDB, notBInfNaN, notBZeroDenorm);

input [12:0] BM;
input SNnotDB;
output notBInfNaN, notBZeroDenorm;

// Check the Master for InfNan or ZeroDenorm
// Inf or nan should also be set for any overflow, either single or
// double length, as this check is also used in rounding 

  ME_OR11 g10 (BM[10], BM[9], BM[8], BM[7], BM[6], BM[5],
            BM[4], BM[3], BM[2], BM[1], BM[0], notBZeroDenorm );

  // Force bits 10 to 8 high when single and AND them
  ME_INVA  g13 ( SNnotDB, DBnotSN );
  ME_NAND3 g12 ( BM[10], BM[9], BM[8], n10 ) ;
  ME_NAND2 g11 ( DBnotSN, n10, doublebits1 ) ;
  
  ME_AND8 zxd (  BM[7], BM[6], BM[5], BM[4], 
                 BM[3], BM[2], BM[1], BM[0], All1s7to0);
  ME_OR3    zxe (  BM[10], BM[9], BM[8], Bit10Or8);
  ME_NAND2  g23 ( SNnotDB, Bit10Or8, notSNGrossOv ) ;
  ME_NAND2  g22 ( doublebits1, All1s7to0, notAll1s ) ;
  ME_INV_A  g21 ( BM[11], notBit11 ) ;
  ME_AND3_B g20 ( notSNGrossOv, notAll1s, notBit11, notBInfNaN ) ;

endmodule