hex2led_common_cathode.v

ps2_键盘控制器源码verilog源码

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module hex2led_common_cathode (hex, led) ;

input   [3:0] hex;
output  [6:0] led;
reg     [6:0] led;

//hex-to-seven-segment decoder
//
// segment encoding
//      0
//     ---  
//  5 |   | 1
//     ---   <- 6
//  4 |   | 2
//     ---
//      3

always @(hex)
begin
    case (hex)                  //数值 共阴极段码  
	4'b0001 : led = 7'b0000110;	//1   06       
	4'b0010 : led = 7'b1011011;	//2   5B
	4'b0011 : led = 7'b1001111;	//3   4F
	4'b0100 : led = 7'b1100110;	//4   66
	4'b0101 : led = 7'b1101101;	//5   6D
	4'b0110 : led = 7'b1111101;	//6   7D
	4'b0111 : led = 7'b0000111;	//7   07
	4'b1000 : led = 7'b1111111;	//8   7F
	4'b1001 : led = 7'b1101111;	//9   6F
	4'b1010 : led = 7'b1110111;	//A   77
	4'b1011 : led = 7'b1111100;	//b   7C
	4'b1100 : led = 7'b0111001;	//C   39
	4'b1101 : led = 7'b1011110;	//d   5E
	4'b1110 : led = 7'b1111001;	//E   79
	4'b1111 : led = 7'b1110001;	//F   71
	default : led = 7'b0111111;	//0   3F
    endcase
end

endmodule