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`timescale 1ns / 1ps
/**
* counter: a generic clearable up-counter
*/
module counter
#(parameter WIDTH=64)
(
input clk,
input ce,
input arst_n,
output reg [WIDTH-1:0] q
);
// some child
clock_buffer #(WIDTH) buffer_inst (
.clk(clk),
.ce(ce),
.reset(arst_n)
);
// Simple gated up-counter with async clear
always @(posedge clk or negedge arst_n) begin
if (arst_n == 1'b0) begin
q <= {WIDTH {1'b0}};
end
else begin
q <= q;
if (ce == 1'b1) begin
q <= q + 1;
end
end
end
endmodule