module nco (
clk,
clken,
phi_inc_i,
fsin_o,
fcos_o,
out_valid,
reset_n);
input clk;
input clken;
input [21:0] phi_inc_i;
output [11:0] fsin_o;
output [11:0] fcos_o;
output out_valid;
input reset_n;
endmodule