P6-40 優先權 3X1多工器 配合HEX0 7-segment Display

P6-40 優先權 3X1多工器 配合HEX0 7-segment Display 

適用於DE2-70

module Priority_en(SW, LEDR, LEDG , CLOCK_27 ,KEY ,HEX0 ,HEX1 ,HEX2,HEX3 );

input  [17:0] SW; // toggle switches
input  [7:0] KEY;     // Push bottom
input  CLOCK_27; //Clock 27MHz , 50Mhz

output [17:0] LEDR; // red  LEDS   
  output [7:0] LEDG; // green LEDs
    
    output [6:0] HEX0,HEX1,HEX2,HEX3; //7-segment display
    
  
//set original program input , output 

    // y, sel, a, b, c);
//output [3:0] y;
    //input [2:0] sel;
//input [3:0] a, b, c;

    reg [3:0] y ;
    wire [2:0] sel;
    wire [3:0] a,b,c;
    
    wire [7:0] segout;
        
    //mapping to hardware 
    assign LEDR = SW;
    
    assign sel=SW[17:15];
    assign a=SW[3:0];
    assign b=SW[7:4];
    assign c=SW[11:8];
    

always @ (sel or a or b or c)
begin
casez (sel)
3'bzz1 : y=a;
3'bz10 : y=b;
3'b100 : y=c;
default : y=4'bzzzz;
endcase
end
    
    assign LEDG[3:0]=y;
    
    //module _7seg(hex , seg);
    _7seg UUT1(.hex(y),
               .seg(segout));
    
    assign HEX0=segout[6:0];
    
    endmodule

//-----------------------------------------
//Common-cathod seven segment display
//using case.....endcase statement
//Filename : sevenseg_case.v
//----------------------------------------- 
module _7seg(hex , seg);

    input  [3:0] hex;
    output [7:0] seg;
    reg    [7:0] seg;
    
        

// segment encoding
//      0
//     ---  
//  5 |   | 1
//     ---   <- 6
//  4 |   | 2
//     ---
//      3

always @(hex)
begin
case (hex)
       // Dot point is always disable
       4'b0001 : seg = 8'b11111001;   //1 = F9H
       4'b0010 : seg = 8'b10100100;   //2 = A4H
       4'b0011 : seg = 8'b10110000;   //3 = B0H
       4'b0100 : seg = 8'b10011001;   //4 = 99H
       4'b0101 : seg = 8'b10010010;   //5 = 92H
       4'b0110 : seg = 8'b10000010;   //6 = 82H
       4'b0111 : seg = 8'b11111000;   //7 = F8H
       4'b1000 : seg = 8'b10000000;   //8 = 80H
       4'b1001 : seg = 8'b10010000;   //9 = 90H
       4'b1010 : seg = 8'b10001000;   //A = 88H
       4'b1011 : seg = 8'b10000011;   //b = 83H
       4'b1100 : seg = 8'b11000110;   //C = C6H
       4'b1101 : seg = 8'b10100001;   //d = A1H
       4'b1110 : seg = 8'b10000110;   //E = 86H
       4'b1111 : seg = 8'b10001110;   //F = 8EH
       default : seg = 8'b11000000;   //0 = C0H
     endcase
   end
   

endmodule