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module demo(input clk, reset, ctrl);
localparam NBITS = 10;
reg [NBITS-1:0] counter;
initial counter[NBITS-2] = 0;
initial counter[0] = 1;
always @(posedge clk) begin
counter <= reset ? 0 : ctrl ? counter + 1 : counter - 1;
assume(counter != 0);
assume(counter != 1 << (NBITS-1));
assert(counter != (1 << NBITS)-1);
end
endmodule
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