digital_clock/rtl/clock_top.v

module clock_top(
    input   wire            sys_clk     ,
    input   wire            sys_rst_n   ,

    output  wire [7: 0]     seg_led     ,
    output  wire [5: 0]     sel_led     
);
wire [4: 0] hour;
wire [5: 0] min ;
wire [5: 0] sec ;

timer   timer_inst(
.sys_clk       (sys_clk),
.sys_rst_n     (sys_rst_n),

.hour          (hour),
.min           (min),
.sec           (sec)
);  

timer_decoder   timer_decoder_inst(
.sys_clk       (sys_clk),
.sys_rst_n     (sys_rst_n),
.hour          (hour),
.min           (min),
.sec           (sec),

.seg_led       (seg_led),
.sel_led       (sel_led)
);

// defparam timer_inst.MAX = 5;//5 * 20 = 100ns
// defparam timer_inst.DAY = 864;//864 * 100 = 86400ns;
// defparam timer_decoder_inst.FPS = 10;//200ns;
endmodule