use 1 Hz clock for visible walking

fsm-tut4/rtl/top.v

@@ -8,11 +8,11 @@ module top(i_clk, o_led, o_led_row_0, i_request, o_busy);
    input wire i_request;
    output wire o_busy;
 
-   wire clk_12MHz;
+   wire clk_1Hz;
 
    clk_gen clk_gen_0 (/*autoinst*/
       // Outputs
-      .o_clk                 (clk_12MHz),
+      .o_clk                 (clk_1Hz),
       // Inputs
       .i_clk                 (i_clk));
 
@@ -34,21 +34,21 @@ module top(i_clk, o_led, o_led_row_0, i_request, o_busy);
       busy_buf = 0;
    end
 
-   always @(posedge clk_12MHz) begin
+   always @(posedge clk_1Hz) begin
       if (!busy_buf && req_buf)
          busy_buf <= 1;
       else
          busy_buf <= (state != 4'h0);
    end
    // counter and strobe run only during busy signal is High
-   always @(posedge clk_12MHz) begin
+   always @(posedge clk_1Hz) begin
       if (busy_buf)
          counter <= counter + 1'b1;
       else
          counter <= 0;
    end
 
-   always @(posedge clk_12MHz) begin
+   always @(posedge clk_1Hz) begin
       if (!busy_buf && req_buf)
          state <= 4'h1;
       else if (state >= 4'hB)
@@ -58,7 +58,7 @@ module top(i_clk, o_led, o_led_row_0, i_request, o_busy);
    end
 
    // fsm for led_buf
-   always @(posedge clk_12MHz) begin
+   always @(posedge clk_1Hz) begin
       case (state)
          4'h1: led_buf <= 6'b00_0001;
          4'h2: led_buf <= 6'b00_0010;