Electronics

Hex to 7-Segment Display Decoder

 Our digit memory is stored as 4-bit hexadecimal values, thus to output to the 7-segment display we require a decoder. The decoder is entirely combinational and doesn't require any latches.It converts our 4-bit value into a 7-bit value representing the activated segments of the display.

module hex_to_7segment(
    in,
    out
  );

input [3:0] in;    // our system clock
output [6:0] out;

// the names of each segment and its bit output
parameter A      = 7'b0000001;
parameter B      = 7'b0000010;
parameter C      = 7'b0000100;
parameter D      = 7'b0001000;
parameter E      = 7'b0010000;
parameter F      = 7'b0100000;
parameter G      = 7'b1000000;

// combine segment to output the digit (it'so easy!)
assign out =
    (in == 4'h0) ? A|B|C|D|E|F :
    (in == 4'h1) ? B|C :
    (in == 4'h2) ? A|B|G|E|D :
    (in == 4'h3) ? A|B|C|D|G :

    (in == 4'h4) ? F|B|G|C :
    (in == 4'h5) ? A|F|G|C|D :
    (in == 4'h6) ? A|F|G|C|D|E :
    (in == 4'h7) ? A|B|C :

    (in == 4'h8) ? A|B|C|D|E|F|G :
    (in == 4'h9) ? A|B|C|D|F|G :
    (in == 4'ha) ? A|F|B|G|E|C :
    (in == 4'hb) ? F|G|C|D|E :

    (in == 4'hc) ? G|E|D :
    (in == 4'hd) ? B|C|G|E|D :
    (in == 4'he) ? A|F|G|E|D :
    (in == 4'hf) ? A|F|G|E :
        4'bz;

endmodule

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