1 //-----------------------------------------------------
  2 // Design Name : pri_encoder_using_if
  3 // File Name   : pri_encoder_using_if.v
  4 // Function    : Pri Encoder using If
  5 // Coder       : Deepak Kumar Tala
  6 //-----------------------------------------------------
  7 module pri_encoder_using_if (
  8 binary_out , //  4 bit binary output
  9 encoder_in , //  16-bit input 
 10 enable       //  Enable for the encoder
 11 );
 12 output [3:0] binary_out ;
 13 input  enable ; 
 14 input [15:0] encoder_in ; 
 15      
 16 reg [3:0] binary_out ;
 17       
 18 always @ (enable or encoder_in)
 19 begin
 20   binary_out = 0;
 21   if (enable) begin
 22    if (encoder_in == {{14{1'bx}},1'b1,{1{1'b0}}}) begin
 23     binary_out = 1; 
 24    end else if (encoder_in == {{13{1'bx}},1'b1,{2{1'b0}}}) begin 
 25     binary_out = 2; 
 26    end else if (encoder_in == {{12{1'bx}},1'b1,{3{1'b0}}}) begin 
 27     binary_out = 3; 
 28    end else if (encoder_in == {{11{1'bx}},1'b1,{4{1'b0}}}) begin 
 29     binary_out = 4; 
 30    end else if (encoder_in == {{10{1'bx}},1'b1,{5{1'b0}}}) begin 
 31     binary_out = 5; 
 32    end else if (encoder_in == {{9{1'bx}},1'b1,{6{1'b0}}}) begin 
 33     binary_out = 6; 
 34    end else if (encoder_in == {{8{1'bx}},1'b1,{7{1'b0}}}) begin 
 35     binary_out = 7; 
 36    end else if (encoder_in == {{7{1'bx}},1'b1,{8{1'b0}}}) begin 
 37     binary_out = 8; 
 38    end else if (encoder_in == {{6{1'bx}},1'b1,{9{1'b0}}}) begin 
 39     binary_out = 9; 
 40    end else if (encoder_in == {{5{1'bx}},1'b1,{10{1'b0}}}) begin 
 41     binary_out = 10; 
 42    end else if (encoder_in == {{4{1'bx}},1'b1,{11{1'b0}}}) begin 
 43     binary_out = 11; 
 44    end else if (encoder_in == {{3{1'bx}},1'b1,{12{1'b0}}}) begin 
 45     binary_out = 12; 
 46    end else if (encoder_in == {{2{1'bx}},1'b1,{13{1'b0}}}) begin 
 47     binary_out = 13; 
 48    end else if (encoder_in == {{1{1'bx}},1'b1,{14{1'b0}}}) begin 
 49     binary_out = 14; 
 50    end else if (encoder_in == {1'b1,{15{1'b0}}}) begin 
 51     binary_out = 15; 
 52    end
 53   end
 54 end
 55 
 56 endmodule  

  1 //-----------------------------------------------------
  2 // Design Name : pri_encoder_using_assign
  3 // File Name   : pri_encoder_using_assign.v
  4 // Function    : Pri Encoder using assign
  5 // Coder       : Deepak Kumar Tala
  6 //-----------------------------------------------------
  7 module pri_encoder_using_assign (
  8 binary_out , //  4 bit binary output
  9 encoder_in , //  16-bit input 
 10 enable       //  Enable for the encoder
 11 );
 12 
 13 output [3:0] binary_out ;
 14 input  enable ; 
 15 input [15:0] encoder_in ; 
 16 
 17 wire [3:0] binary_out ;
 18       
 19 assign  binary_out  = ( ! enable) ? 0 : (
 20     (encoder_in == 16'bxxxx_xxxx_xxxx_xxx1) ? 0 : 
 21     (encoder_in == 16'bxxxx_xxxx_xxxx_xx10) ? 1 : 
 22     (encoder_in == 16'bxxxx_xxxx_xxxx_x100) ? 2 : 
 23     (encoder_in == 16'bxxxx_xxxx_xxxx_1000) ? 3 : 
 24     (encoder_in == 16'bxxxx_xxxx_xxx1_0000) ? 4 : 
 25     (encoder_in == 16'bxxxx_xxxx_xx10_0000) ? 5 : 
 26     (encoder_in == 16'bxxxx_xxxx_x100_0000) ? 6 : 
 27     (encoder_in == 16'bxxxx_xxxx_1000_0000) ? 7 : 
 28     (encoder_in == 16'bxxxx_xxx1_0000_0000) ? 8 : 
 29     (encoder_in == 16'bxxxx_xx10_0000_0000) ? 9 : 
 30     (encoder_in == 16'bxxxx_x100_0000_0000) ? 10 : 
 31     (encoder_in == 16'bxxxx_1000_0000_0000) ? 11 : 
 32     (encoder_in == 16'bxxx1_0000_0000_0000) ? 12 : 
 33     (encoder_in == 16'bxx10_0000_0000_0000) ? 13 : 
 34     (encoder_in == 16'bx100_0000_0000_0000) ? 14 : 15); 
 35 
 36 endmodule 

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Deepak Kumar Tala - All rights reserved

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