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/*

/*

 Asynchronous SDM NoC

 Asynchronous SDM NoC

 (C)2011 Wei Song

 (C)2011 Wei Song

 Advanced Processor Technologies Group

 Advanced Processor Technologies Group

 Computer Science, the Univ. of Manchester, UK

 Computer Science, the Univ. of Manchester, UK

 Authors:

 Authors:

 Wei Song     wsong83@gmail.com

 Wei Song     wsong83@gmail.com

 License: LGPL 3.0 or later

 License: LGPL 3.0 or later

 1-of-4 data comparator

 1-of-4 data comparator

 History:

 History:

 11/05/2010  Initial version. <wsong83@gmail.com>

 11/05/2010  Initial version. <wsong83@gmail.com>

 01/06/2011  Clean up for opensource. <wsong83@gmail.com>

 01/06/2011  Clean up for opensource. <wsong83@gmail.com>

*/

*/

module comp4 (/*AUTOARG*/

module comp4 (/*AUTOARG*/

   // Outputs

   // Outputs

   q,

   q,

   // Inputs

   // Inputs

   a, b

   a, b

   );

   );

   input [3:0]   a, b;           // the data inputs to be compared

   input [3:0]   a, b;           // the data inputs to be compared

   output [2:0]  q;              // the comparison result

   output [2:0]  q;              // the comparison result

   // a > b

   // a > b

   assign q[0] = (a[3]&(|b[2:0])) | (a[2]&(|b[1:0])) | (a[1]&(|b[0:0]));

   assign q[0] = (a[3]&(|b[2:0])) | (a[2]&(|b[1:0])) | (a[1]&(|b[0:0]));

   // a < b

   // a < b

   assign q[1] = (a[2]&(|b[3:3])) | (a[1]&(|b[3:2])) | (a[0]&(|b[3:1]));

   assign q[1] = (a[2]&(|b[3:3])) | (a[1]&(|b[3:2])) | (a[0]&(|b[3:1]));

   // a = b

   // a = b

   assign q[2] = (a[3]&b[3]) | (a[2]&b[2]) | (a[1]&b[1]) | (a[0]&b[0]);

   assign q[2] = (a[3]&b[3]) | (a[2]&b[2]) | (a[1]&b[1]) | (a[0]&b[0]);

endmodule // comp4

endmodule // comp4