graycounter.v
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7/25/2019 GrayCounter.V
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//==========================================// Function : Code Gray counter.// Coder : Alex Claros F.// Date : 15/May/2005.//=======================================
`timescale 1ns/1ps
module GrayCounter #(parameter COUNTER_WIDTH = 4)
(output reg [COUNTER_WIDTH-1:0] GrayCount_out, //'Gray' code count output.
input wire Enable_in, //Count enable. input wire Clear_in, //Count reset.
input wire Clk);
/////////Internal connections & variables/////// reg [COUNTER_WIDTH-1:0] BinaryCount;
/////////Code///////////////////////
always @ (posedge Clk) if (Clear_in) begin BinaryCount <= {COUNTER_WIDTH{1'b 0}} + 1; //Gray count begins @'1' with GrayCount_out <= {COUNTER_WIDTH{1'b 0}}; // first 'Enable_in'. end else if (Enable_in) begin BinaryCount <= BinaryCount + 1; GrayCount_out <= {BinaryCount[COUNTER_WIDTH-1], BinaryCount[COUNTER_WIDTH-2:0] ^ BinaryCount[COUNTER_WIDTH-1:1]}; end
endmodule