module clkgen #(
PERIOD_NS = 10,
RESET_DELAY_NS = 45
) (
output logic clk,
output logic nreset
);
initial begin
clk <= 1'b1;
nreset <= 1'b0;
#RESET_DELAY_NS nreset <= 1'b1;
end
always
#(PERIOD_NS/2) clk <= ~clk;
endmodule