case3.v

《数字信号处理的FPGA实现》代码

//*********************************************************
// IEEE STD 1364-1995 Verilog file: case3.v 
// Author-EMAIL: [e-mail]
//*********************************************************
module case3 (table_in, table_out);

  input  [2:0] table_in;  // Three bit 
  output [2:0] table_out; // Range 0 to 6

  reg [2:0] table_out;

// This is the DA CASE table for
// the 3 coefficients: 2, 3, 1  

  always @(table_in)
  begin
    case (table_in)
      0 :     table_out =  0;
      1 :     table_out =  2;
      2 :     table_out =  3;
      3 :     table_out =  5;
      4 :     table_out =  1;
      5 :     table_out =  3;
      6 :     table_out =  4;
      7 :     table_out =  6;
      default : ;
    endcase
  end

endmodule