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MIT的一个数字频综源代码

module: int_to_non_neg_double
parameters: int b, int beta
inputs: int in, double clk
outputs:  double out
static_variables: 
int mask_b
int mask_error
int mask_out
classes: EdgeDetect clkedge()
init: 
if (b > 32 || b < 1)
  {
   printf("error in 'int_to_non_neg_double':  must have 1 <= b <= 32\n");
   printf("   in this case, b = %d\n",b);
   exit(1);
 }
if (beta > b || beta < 0)
  {
   printf("error in 'int_to_non_neg_double':  must have 0 <= beta <= b\n");
   printf("   in this case, beta = %d, b = %d\n",beta,b);
   exit(1);
 }
if (b == 32) 
   mask_b = ~0;
else
   mask_b = (1 << b) - 1;
mask_error = (1 << beta) - 1;
mask_out = mask_b ^ mask_error;
code:
double int_part, frac_part;
if (clkedge.inp(clk))
   {
   int_part = (double) ((in & (~mask_error)) >> beta);
   frac_part = (double) (in & mask_error);
   out = int_part + frac_part/((double) (1<<beta));
   }