_primary.vhd

viterbi decoder , use verilog HDL language.

library verilog;
use verilog.vl_types.all;
entity acs4 is
    port(
        y2_s1           : in     vl_logic;
        y1_s1           : in     vl_logic;
        sel_initial_s1  : in     vl_logic;
        decisions_s1    : out    vl_logic_vector(3 downto 0);
        path_metrics_s1 : out    vl_logic_vector(15 downto 0);
        phi1            : in     vl_logic;
        phi2            : in     vl_logic
    );
end acs4;