Lab_02 PingPong Counter#

`timescale 1ns / 1ps

module Ping_Pong_Counter_tb;

reg CLK,RESET_n,enable;
wire direction;
wire [3:0] out;

Ping_Pong_Counter p(CLK, RESET_n, enable, direction, out);

always #5 CLK=~CLK;
// The clock tick once per 5ns, then one cycle is 10ns.
initial begin
    
    CLK = 1'b0;
    RESET_n = 1'b1;
    enable = 1'b1;
    #200; // 20 cycles
    RESET_n = 1'b0;
    #200; // 20 cycles
    RESET_n = 1'b1;
    #200; // 20 cycles
    enable = 1'b0;
    #200; // 20 cycles
    enable = 1'b1;
    #200; // 20 cycles
    RESET_n = 1'b0;
    enable = 1'b0;
    #200 // 20 cycles
    $finish;

end
always @(enable, RESET_n) begin
    $display(" ");
end
always@(posedge CLK) begin
    #2;
    $display(($time-7), " : ( out = %d  ||  direction = %b )", out, direction);
end
endmodule

                   0 : ( out =  x  ||  direction = x )
                  10 : ( out =  x  ||  direction = x )
                  20 : ( out =  x  ||  direction = x )
                  30 : ( out =  x  ||  direction = x )
                  40 : ( out =  x  ||  direction = x )
                  50 : ( out =  x  ||  direction = x )
                  60 : ( out =  x  ||  direction = x )
                  70 : ( out =  x  ||  direction = x )
                  80 : ( out =  x  ||  direction = x )
                  90 : ( out =  x  ||  direction = x )
                 100 : ( out =  x  ||  direction = x )
                 110 : ( out =  x  ||  direction = x )
                 120 : ( out =  x  ||  direction = x )
                 130 : ( out =  x  ||  direction = x )
                 140 : ( out =  x  ||  direction = x )
                 150 : ( out =  x  ||  direction = x )
                 160 : ( out =  x  ||  direction = x )
                 170 : ( out =  x  ||  direction = x )
                 180 : ( out =  x  ||  direction = x )
                 190 : ( out =  x  ||  direction = x )

                 200 : ( out =  0  ||  direction = 0 )
                 210 : ( out =  0  ||  direction = 0 )
                 220 : ( out =  0  ||  direction = 0 )
                 230 : ( out =  0  ||  direction = 0 )
                 240 : ( out =  0  ||  direction = 0 )
                 250 : ( out =  0  ||  direction = 0 )
                 260 : ( out =  0  ||  direction = 0 )
                 270 : ( out =  0  ||  direction = 0 )
                 280 : ( out =  0  ||  direction = 0 )
                 290 : ( out =  0  ||  direction = 0 )
                 300 : ( out =  0  ||  direction = 0 )
                 310 : ( out =  0  ||  direction = 0 )
                 320 : ( out =  0  ||  direction = 0 )
                 330 : ( out =  0  ||  direction = 0 )
                 340 : ( out =  0  ||  direction = 0 )
                 350 : ( out =  0  ||  direction = 0 )
                 360 : ( out =  0  ||  direction = 0 )
                 370 : ( out =  0  ||  direction = 0 )
                 380 : ( out =  0  ||  direction = 0 )
                 390 : ( out =  0  ||  direction = 0 )

                 400 : ( out =  1  ||  direction = 0 )
                 410 : ( out =  2  ||  direction = 0 )
                 420 : ( out =  3  ||  direction = 0 )
                 430 : ( out =  4  ||  direction = 0 )
                 440 : ( out =  5  ||  direction = 0 )
                 450 : ( out =  6  ||  direction = 0 )
                 460 : ( out =  7  ||  direction = 0 )
                 470 : ( out =  8  ||  direction = 0 )
                 480 : ( out =  9  ||  direction = 0 )
                 490 : ( out = 10  ||  direction = 0 )
                 500 : ( out = 11  ||  direction = 0 )
                 510 : ( out = 12  ||  direction = 0 )
                 520 : ( out = 13  ||  direction = 0 )
                 530 : ( out = 14  ||  direction = 0 )
                 540 : ( out = 15  ||  direction = 0 )
                 550 : ( out = 14  ||  direction = 1 )
                 560 : ( out = 13  ||  direction = 1 )
                 570 : ( out = 12  ||  direction = 1 )
                 580 : ( out = 11  ||  direction = 1 )
                 590 : ( out = 10  ||  direction = 1 )

                 600 : ( out = 10  ||  direction = 1 )
                 610 : ( out = 10  ||  direction = 1 )
                 620 : ( out = 10  ||  direction = 1 )
                 630 : ( out = 10  ||  direction = 1 )
                 640 : ( out = 10  ||  direction = 1 )
                 650 : ( out = 10  ||  direction = 1 )
                 660 : ( out = 10  ||  direction = 1 )
                 670 : ( out = 10  ||  direction = 1 )
                 680 : ( out = 10  ||  direction = 1 )
                 690 : ( out = 10  ||  direction = 1 )
                 700 : ( out = 10  ||  direction = 1 )
                 710 : ( out = 10  ||  direction = 1 )
                 720 : ( out = 10  ||  direction = 1 )
                 730 : ( out = 10  ||  direction = 1 )
                 740 : ( out = 10  ||  direction = 1 )
                 750 : ( out = 10  ||  direction = 1 )
                 760 : ( out = 10  ||  direction = 1 )
                 770 : ( out = 10  ||  direction = 1 )
                 780 : ( out = 10  ||  direction = 1 )
                 790 : ( out = 10  ||  direction = 1 )

                 800 : ( out =  9  ||  direction = 1 )
                 810 : ( out =  8  ||  direction = 1 )
                 820 : ( out =  7  ||  direction = 1 )
                 830 : ( out =  6  ||  direction = 1 )
                 840 : ( out =  5  ||  direction = 1 )
                 850 : ( out =  4  ||  direction = 1 )
                 860 : ( out =  3  ||  direction = 1 )
                 870 : ( out =  2  ||  direction = 1 )
                 880 : ( out =  1  ||  direction = 1 )
                 890 : ( out =  0  ||  direction = 1 )
                 900 : ( out =  1  ||  direction = 0 )
                 910 : ( out =  2  ||  direction = 0 )
                 920 : ( out =  3  ||  direction = 0 )
                 930 : ( out =  4  ||  direction = 0 )
                 940 : ( out =  5  ||  direction = 0 )
                 950 : ( out =  6  ||  direction = 0 )
                 960 : ( out =  7  ||  direction = 0 )
                 970 : ( out =  8  ||  direction = 0 )
                 980 : ( out =  9  ||  direction = 0 )
                 990 : ( out = 10  ||  direction = 0 )

                1000 : ( out =  0  ||  direction = 0 )
                1010 : ( out =  0  ||  direction = 0 )
                1020 : ( out =  0  ||  direction = 0 )
                1030 : ( out =  0  ||  direction = 0 )
                1040 : ( out =  0  ||  direction = 0 )
                1050 : ( out =  0  ||  direction = 0 )
                1060 : ( out =  0  ||  direction = 0 )
                1070 : ( out =  0  ||  direction = 0 )
                1080 : ( out =  0  ||  direction = 0 )
                1090 : ( out =  0  ||  direction = 0 )
                1100 : ( out =  0  ||  direction = 0 )
                1110 : ( out =  0  ||  direction = 0 )
                1120 : ( out =  0  ||  direction = 0 )
                1130 : ( out =  0  ||  direction = 0 )
                1140 : ( out =  0  ||  direction = 0 )
                1150 : ( out =  0  ||  direction = 0 )
                1160 : ( out =  0  ||  direction = 0 )
                1170 : ( out =  0  ||  direction = 0 )
                1180 : ( out =  0  ||  direction = 0 )
                1190 : ( out =  0  ||  direction = 0 )

`timescale 1ns / 1ps

module Ping_Pong_Counter_tb;

reg CLK,RESET_n,enable;
wire direction;
wire [3:0] out;

Ping_Pong_Counter p(CLK, RESET_n, enable, direction, out);

always #5 CLK=~CLK;
// The clock tick once per 5ns, then one cycle is 10ns.
initial begin
    
    CLK = 1'b1;
    RESET_n = 1'b0;
    enable = 1'b0;
    #200; // 20 cycles
    enable = 1'b1;
    #250; // 25 cycles
    RESET_n = 1'b1;
    #200; // 20 cycles
    enable = 1'b0;
    #250; // 25 cycles
    enable = 1'b1;
    RESET_n = 1'b0;
    #200; // 20 cycles
    RESET_n = 1'b1;
    #250 // 25 cycles
    $finish;

end
always @(enable, RESET_n) begin
    $display(" ");
end
always@(posedge CLK) begin
    #2;
    $display(($time-2), " : ( out = %d  ||  direction = %b )", out, direction);
end
endmodule

                  10 : ( out =  0  ||  direction = 0 )
                  20 : ( out =  0  ||  direction = 0 )
                  30 : ( out =  0  ||  direction = 0 )
                  40 : ( out =  0  ||  direction = 0 )
                  50 : ( out =  0  ||  direction = 0 )
                  60 : ( out =  0  ||  direction = 0 )
                  70 : ( out =  0  ||  direction = 0 )
                  80 : ( out =  0  ||  direction = 0 )
                  90 : ( out =  0  ||  direction = 0 )
                 100 : ( out =  0  ||  direction = 0 )
                 110 : ( out =  0  ||  direction = 0 )
                 120 : ( out =  0  ||  direction = 0 )
                 130 : ( out =  0  ||  direction = 0 )
                 140 : ( out =  0  ||  direction = 0 )
                 150 : ( out =  0  ||  direction = 0 )
                 160 : ( out =  0  ||  direction = 0 )
                 170 : ( out =  0  ||  direction = 0 )
                 180 : ( out =  0  ||  direction = 0 )
                 190 : ( out =  0  ||  direction = 0 )
 
                 200 : ( out =  0  ||  direction = 0 )
                 210 : ( out =  0  ||  direction = 0 )
                 220 : ( out =  0  ||  direction = 0 )
                 230 : ( out =  0  ||  direction = 0 )
                 240 : ( out =  0  ||  direction = 0 )
                 250 : ( out =  0  ||  direction = 0 )
                 260 : ( out =  0  ||  direction = 0 )
                 270 : ( out =  0  ||  direction = 0 )
                 280 : ( out =  0  ||  direction = 0 )
                 290 : ( out =  0  ||  direction = 0 )
                 300 : ( out =  0  ||  direction = 0 )
                 310 : ( out =  0  ||  direction = 0 )
                 320 : ( out =  0  ||  direction = 0 )
                 330 : ( out =  0  ||  direction = 0 )
                 340 : ( out =  0  ||  direction = 0 )
                 350 : ( out =  0  ||  direction = 0 )
                 360 : ( out =  0  ||  direction = 0 )
                 370 : ( out =  0  ||  direction = 0 )
                 380 : ( out =  0  ||  direction = 0 )
                 390 : ( out =  0  ||  direction = 0 )
                 400 : ( out =  0  ||  direction = 0 )
                 410 : ( out =  0  ||  direction = 0 )
                 420 : ( out =  0  ||  direction = 0 )
                 430 : ( out =  0  ||  direction = 0 )
                 440 : ( out =  0  ||  direction = 0 )
 
                 450 : ( out =  1  ||  direction = 0 )
                 460 : ( out =  2  ||  direction = 0 )
                 470 : ( out =  3  ||  direction = 0 )
                 480 : ( out =  4  ||  direction = 0 )
                 490 : ( out =  5  ||  direction = 0 )
                 500 : ( out =  6  ||  direction = 0 )
                 510 : ( out =  7  ||  direction = 0 )
                 520 : ( out =  8  ||  direction = 0 )
                 530 : ( out =  9  ||  direction = 0 )
                 540 : ( out = 10  ||  direction = 0 )
                 550 : ( out = 11  ||  direction = 0 )
                 560 : ( out = 12  ||  direction = 0 )
                 570 : ( out = 13  ||  direction = 0 )
                 580 : ( out = 14  ||  direction = 0 )
                 590 : ( out = 15  ||  direction = 0 )
                 600 : ( out = 14  ||  direction = 1 )
                 610 : ( out = 13  ||  direction = 1 )
                 620 : ( out = 12  ||  direction = 1 )
                 630 : ( out = 11  ||  direction = 1 )
                 640 : ( out = 10  ||  direction = 1 )
 
                 650 : ( out = 10  ||  direction = 1 )
                 660 : ( out = 10  ||  direction = 1 )
                 670 : ( out = 10  ||  direction = 1 )
                 680 : ( out = 10  ||  direction = 1 )
                 690 : ( out = 10  ||  direction = 1 )
                 700 : ( out = 10  ||  direction = 1 )
                 710 : ( out = 10  ||  direction = 1 )
                 720 : ( out = 10  ||  direction = 1 )
                 730 : ( out = 10  ||  direction = 1 )
                 740 : ( out = 10  ||  direction = 1 )
                 750 : ( out = 10  ||  direction = 1 )
                 760 : ( out = 10  ||  direction = 1 )
                 770 : ( out = 10  ||  direction = 1 )
                 780 : ( out = 10  ||  direction = 1 )
                 790 : ( out = 10  ||  direction = 1 )
                 800 : ( out = 10  ||  direction = 1 )
                 810 : ( out = 10  ||  direction = 1 )
                 820 : ( out = 10  ||  direction = 1 )
                 830 : ( out = 10  ||  direction = 1 )
                 840 : ( out = 10  ||  direction = 1 )
                 850 : ( out = 10  ||  direction = 1 )
                 860 : ( out = 10  ||  direction = 1 )
                 870 : ( out = 10  ||  direction = 1 )
                 880 : ( out = 10  ||  direction = 1 )
                 890 : ( out = 10  ||  direction = 1 )
 
                 900 : ( out =  0  ||  direction = 0 )
                 910 : ( out =  0  ||  direction = 0 )
                 920 : ( out =  0  ||  direction = 0 )
                 930 : ( out =  0  ||  direction = 0 )
                 940 : ( out =  0  ||  direction = 0 )
                 950 : ( out =  0  ||  direction = 0 )
                 960 : ( out =  0  ||  direction = 0 )
                 970 : ( out =  0  ||  direction = 0 )
                 980 : ( out =  0  ||  direction = 0 )
                 990 : ( out =  0  ||  direction = 0 )
                1000 : ( out =  0  ||  direction = 0 )
                1010 : ( out =  0  ||  direction = 0 )
                1020 : ( out =  0  ||  direction = 0 )
                1030 : ( out =  0  ||  direction = 0 )
                1040 : ( out =  0  ||  direction = 0 )
                1050 : ( out =  0  ||  direction = 0 )
                1060 : ( out =  0  ||  direction = 0 )
                1070 : ( out =  0  ||  direction = 0 )
                1080 : ( out =  0  ||  direction = 0 )
                1090 : ( out =  0  ||  direction = 0 )
 
                1100 : ( out =  1  ||  direction = 0 )
                1110 : ( out =  2  ||  direction = 0 )
                1120 : ( out =  3  ||  direction = 0 )
                1130 : ( out =  4  ||  direction = 0 )
                1140 : ( out =  5  ||  direction = 0 )
                1150 : ( out =  6  ||  direction = 0 )
                1160 : ( out =  7  ||  direction = 0 )
                1170 : ( out =  8  ||  direction = 0 )
                1180 : ( out =  9  ||  direction = 0 )
                1190 : ( out = 10  ||  direction = 0 )
                1200 : ( out = 11  ||  direction = 0 )
                1210 : ( out = 12  ||  direction = 0 )
                1220 : ( out = 13  ||  direction = 0 )
                1230 : ( out = 14  ||  direction = 0 )
                1240 : ( out = 15  ||  direction = 0 )
                1250 : ( out = 14  ||  direction = 1 )
                1260 : ( out = 13  ||  direction = 1 )
                1270 : ( out = 12  ||  direction = 1 )
                1280 : ( out = 11  ||  direction = 1 )
                1290 : ( out = 10  ||  direction = 1 )
                1300 : ( out =  9  ||  direction = 1 )
                1310 : ( out =  8  ||  direction = 1 )
                1320 : ( out =  7  ||  direction = 1 )
                1330 : ( out =  6  ||  direction = 1 )
                1340 : ( out =  5  ||  direction = 1 )