clk40 clk40 rst40 rst40 opt_code[1:0] opt_code[1:0] HEXRADIX trg_ctb trg_ctb rnd_trg rnd_trg trg_out trg_out trg_i trg_i trg_out_i trg_out_i sign_serial sign_serial send_sign send_sign send_sign_r send_sign_r pload pload cnt_sign[9:0] cnt_sign[9:0] HEXRADIX signature[6:0] signature[6:0] HEXRADIX