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clock_divider_param.v

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+// This module devide FPGA input clock 
+// by DIVIDER. Result is 50% duty cicle 
+// pulses.
+//
+//
+module clock_divider #(
+    parameter DIVIDER =2,
+    parameter WIDTH =2
+) (
+    input clk,
+    output clk_out);
+
+reg state=1'b0, next_state=1'b1;
+reg [WIDTH-1:0] counter = DIVIDER-1 ; 
+
+always@(posedge clk)begin
+    state <= next_state;
+    if ( counter == 0) begin
+        next_state <= ~next_state;
+        counter <= DIVIDER-1;
+    end
+    else if (counter >= 0 )
+        counter <= counter - 1;
+end
+
+assign clk_out = state;
+
+endmodule