Below is verilog code for digital clock

Please construct state table based on verilog code below :

Subject : digital electronic

module clock(out,reset,clk,seg,enable,hours,stopwatch);

input reset,clk,stopwatch;//reset,clk and stopwatch is the input of digital clock.

output reg [7:0]out;//out is a 8 bit output,which is used for LED.

output reg [3:0]enable,seg;//4 bit enable and segment signal are used.

reg [25:0]count1,count2;//count1 and count2 is used for count the posedge of clock.

reg [3:0]sec0,sec1,min0,min1;//sec0,sec1,min0,min1 are 4 bit counters.

reg clk_1s,clk_count ;//clk_1s will goes high in every 1 second and clk_count is used for switching.

reg [3:0]counter;//4 bit counter is used.

output reg [4:0]hours;//5 bit binary output is used for hours.

always @(posedge clk)

begin

if(reset)

count1=26'd0;

else if

(count1 == 26'd25000000)//this always block is used for generating clock of 1 second.

begin

clk_1s = ~clk_1s;

count1 = 26'd0; end

else if(stopwatch==1'b1)//if stopwatch is high then our output will stop.

clk_1s=1'b0;

else

count1 = count1+26'd1;

end

always@(posedge clk)

begin

if(count2==26'd10000)//this always block is used for switching the 7 segment LED.

begin

clk_count=~clk_count;

count2<=26'd0;

end

else

count2<=count2+1;

end

always@(posedge clk_1s )

begin

if(reset==1'b1) begin //this always block works on 1 second of clock.

sec0=0;

sec1=0;

min0=0;

min1=0; end

else if(sec0<9)//if LSB bit of second is less than 9 then it will increse.

sec0=sec0+1;

else if(sec1<5) //if MSB bit of second is less than 5 then it will increse

begin //and LSB bit of second will become 0.

sec1=sec1+1;

sec0=0;

end

else if(min0<9) //if LSB bit of minute is less than 9 then it will increse

begin //and LSB bit of second will become 0.

min0=min0+1; //and MSB bit of second will become 0.

sec0=0;

sec1=0;

end

else if(min1<5)//if MSB bit of minute is less than 5 then it will increse

begin //and MSB bit of second will become 0.

min1=min1+1; //and LSB bit of second will become 0.

sec0=0; //and LSB bit of minute will become 0.

sec1=0;

min0=0;

end

else if(min1==4'd5&&min0==4'd9&&sec0==4'd9&&sec1==4'd5)

begin //if minute is 59 and second is 59 then it will work.

sec0=0; //if all the above conditions are satisfied then

sec1=0; // all the minutes and seconds will become 0

min0=0;// and hours will incremented and give binary output.

min1=0;

hours=hours+5'd1;

end

else if(hours==5'd24)

begin

hours=5'b00000;//if hours is greater than 24 then

sec0=0; //all the minutes,seconds and hours will start from 0.

sec1=0;

min0=0;

min1=0; end

end

always @(posedge clk_count)//this always block is used for enabling the LED

begin //and assigning the value of minute and second in seg

if(reset) //and enabling the dot on 7 segment LED.

counter=0;

else

counter=counter+1;

case(counter)

4'b0001 :

begin enable=4'b1110;

seg <= sec0;

out[7]<=1; end

4'b0010 :

begin enable=4'b1101;

seg <= sec1;

out[7]<=1; end

4'b0011 :

begin enable=4'b1011;

seg <= min0;

out[7]<=clk_1s; end

4'b0100 :

begin enable=4'b0111;

seg <= min1;

out[7]<=1; end

default : counter=4'b0000;

endcase

end

//this always block is used as BCD to 7 segment converter.

always@(seg)

begin

case(seg)//this case is working on seg.

4'b0000 :out[6:0] = 7'b0000001;

4'b0001 :out[6:0] = 7'b1001111;

4'b0010 :out[6:0] = 7'b0010010;

4'b0011 :out[6:0] = 7'b0000110;

4'b0100 :out[6:0] = 7'b1001100;

4'b0101 :out[6:0] = 7'b0100100;

4'b0110 :out[6:0] = 7'b0100000;

4'b0111 :out[6:0] = 7'b0001111;

4'b1000 :out[6:0] = 7'b0000000;

4'b1001 :out[6:0] = 7'b0000100;

endcase

end

endmodule