129 lines
4.0 KiB
Plaintext
129 lines
4.0 KiB
Plaintext
// Sumbission for ELEC4720 Assignment 1 Question 1
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// Oliver Boutros (c3428958)
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// Riley King-Saunders (c
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`ifndef SEVEN_SEG_H_SV
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`define SEVEN_SEG_H_SV
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module seven_seg(
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input logic [3:0] num, // Input binary
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input logic [0:0] rbi_inv, // Ripple blanking input
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output logic [7:0] segments); // segent[0] = Ripple blanking out, segment[1] to segment[7] 7 seg LEDs
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always_comb begin
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case (num) // implement truth table as case statement
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4'b0000: segments = (rbi_inv) ? ~(8'b01111111) : ~(8'b00000000); // zero or blank
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4'b0001: segments = ~(8'b00001101);
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4'b0010: segments = ~(8'b10110111);
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4'b0011: segments = ~(8'b10011111);
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4'b0100: segments = ~(8'b11001101);
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4'b0101: segments = ~(8'b11011011);
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4'b0110: segments = ~(8'b11111011);
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4'b0111: segments = ~(8'b00001111);
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4'b1000: segments = ~(8'b11111111);
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4'b1001: segments = ~(8'b11001111);
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4'b1010: segments = ~(8'b11101111);
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4'b1011: segments = ~(8'b11111001);
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4'b1100: segments = ~(8'b01110011);
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4'b1101: segments = ~(8'b10111101);
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4'b1110: segments = ~(8'b11110011);
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4'b1111: segments = ~(8'b11100011);
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default: segments = ~(8'bxxxxxxxx);
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endcase
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end
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endmodule
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module seven_seg_2digit(
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input logic [3:0] b, // left
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input logic [3:0] a, // right
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output logic [7:0] seg_b, // left
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output logic [7:0] seg_a); // right
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// seg_b
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seven_seg left_digit(
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.num(b),
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.rbi_inv(1'b0), // blanking enabled
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.segments(seg_b)
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);
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// seg_a
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seven_seg right_digit(
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.num(a),
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.rbi_inv(1'b1), // blanking disabled
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.segments(seg_a)
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);
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endmodule
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`endif
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// Testbench below
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module seven_seg_tb();
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logic [3:0] in_num;
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logic [0:0] in_rbi_inv;
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logic [7:0] out_segments;
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logic [7:0] true_segments[17];
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seven_seg dut(in_num, in_rbi_inv, out_segments);
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integer N;
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integer i;
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integer error_count;
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initial begin
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// Initialise truth table
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true_segments[0 ] = ~(8'b01111111);
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true_segments[1 ] = ~(8'b00001101);
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true_segments[2 ] = ~(8'b10110111);
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true_segments[3 ] = ~(8'b10011111);
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true_segments[4 ] = ~(8'b11001101);
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true_segments[5 ] = ~(8'b11011011);
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true_segments[6 ] = ~(8'b11111011);
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true_segments[7 ] = ~(8'b00001111);
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true_segments[8 ] = ~(8'b11111111);
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true_segments[9 ] = ~(8'b11001111);
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true_segments[10] = ~(8'b11101111);
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true_segments[11] = ~(8'b11111001);
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true_segments[12] = ~(8'b01110011);
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true_segments[13] = ~(8'b10111101);
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true_segments[14] = ~(8'b11110011);
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true_segments[15] = ~(8'b11100011);
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true_segments[16] = ~(8'b00000000); // Special case for RBI
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$display("Beginning seven-segment tests");
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in_num = 4'd0;
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in_rbi_inv = 1'b0;
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error_count = 0;
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#1;
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if (out_segments !== true_segments[16]) begin
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$display("\t\x1b[38;5;9mNumber 0b%b failed to decode to 0b%b, producing 0b%b\x1b[m", in_num, true_segments[16], out_segments);
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error_count = error_count + 1;
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end
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for (N=1; N < 15; ++N) begin
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in_num = in_num + 1;
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#1;
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if (out_segments !== true_segments[N]) begin
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$display("\t\x1b[38;5;9mNumber 0b%b failed to decode to 0b%b, producing 0b%b\x1b[m", in_num, true_segments[N], out_segments);
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error_count = error_count + 1;
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end
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end
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in_num = 4'd0;
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in_rbi_inv = 1'b1;
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for (N=0; N < 15; ++N) begin
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#1;
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if (out_segments !== true_segments[N]) begin
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$display("\t\x1b[38;5;9mNumber 0b%b failed to decode to 0b%b, producing 0b%b\x1b[m", in_num, true_segments[N], out_segments);
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error_count = error_count + 1;
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end
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in_num = in_num + 1;
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end
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if (error_count == 0) $display("\x1b[38;5;10mAll seven-segment tests passing\x1b[m");
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else $display("\x1b[38;5;9m%0d seven-segment test(s) failing\x1b[m", error_count);
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end
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endmodule
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