HDL Count clock

1原题复现

2.代码

module top_module(
    input clk,
    input reset,
    input ena,
    output pm,
    output [7:0] hh,
    output [7:0] mm,
    output [7:0] ss); 
    
    reg [3:0] ss_gewei=0;
    reg [3:0] ss_shiwei=0;
    
    reg [3:0] mm_gewei=0;
    reg [3:0] mm_shiwei=0;
    
    reg [3:0] hh_gewei =0;
    reg [3:0] hh_shiwei =0;
    
    
    //ss
    always@(posedge clk)begin
        
        if(reset)begin
           ss_shiwei<=4'd0; 
            ss_gewei<=4'd0;
        end
        
        else if(ena)begin
            if(ss_gewei==4'h9)begin
           		   ss_gewei<=0; 
                if(ss_shiwei==4'h5)begin
                   ss_shiwei<=0; 
                end
                
                else begin
                   ss_shiwei<= ss_shiwei+1; 
                end
                
            end
            else ss_gewei<=ss_gewei+1;
            
        end
        
        end
    
    assign ss = {ss_shiwei,ss_gewei};
    
    
    //mm
		always@(posedge clk)begin
        if(reset)begin
           mm_shiwei<=4'd0; 
            mm_gewei<=4'd0;
        end
            else if(ss_shiwei == 4'h5 && ss_gewei == 4'h9  && ena==1'b1)begin
            if(mm_gewei==4'h9)begin
           		   mm_gewei<=0; 
                if(mm_shiwei==4'h5)begin
                   mm_shiwei<=0; 
                end
                else begin
                   mm_shiwei<= mm_shiwei+1; 
                end
            end
            else mm_gewei<=mm_gewei+1;
        end
        end
    assign mm = {mm_shiwei,mm_gewei};
    
    
    //hh
    always@(posedge clk)begin
        
        if(reset)begin
           hh_shiwei<=4'd1; 
            hh_gewei<=4'd2;
            pm<=0;
        end
        
        else if(ss_shiwei == 4'h5 && ss_gewei == 4'h9  && ena==1'b1 && mm_shiwei == 4'h5 && mm_gewei == 4'h9)begin
            if(hh_shiwei==4'h0)begin   
                
                if(hh_gewei ==4'h9)begin
                    hh_gewei<=0;
                    hh_shiwei <= 1'b1;
                end
                
                else begin
                    hh_gewei <= hh_gewei+1;
                end
            end
            
            else if(hh_shiwei==4'h1)begin
                if(hh_gewei ==4'h1)begin
                   hh_gewei <=4'h2;
					pm <= ~pm;
                end
                if(hh_gewei == 4'h2)begin
                   hh_gewei <=1'b1;
                   hh_shiwei <=1'b0;
                end
                else hh_gewei <= hh_gewei +1;
            end
                        end
    end
            assign hh = {hh_shiwei,hh_gewei};
endmodule

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