_primary.vhd

viterbi decoder , use verilog HDL language.

library verilog;
use verilog.vl_types.all;
entity acs1 is
    port(
        phi1            : in     vl_logic;
        phi2            : in     vl_logic;
        path_metric0_s1 : in     vl_logic_vector(3 downto 0);
        path_metric1_s1 : in     vl_logic_vector(3 downto 0);
        branch_metric0_s1: in     vl_logic_vector(1 downto 0);
        branch_metric1_s1: in     vl_logic_vector(1 downto 0);
        path_metric_out_s1: out    vl_logic_vector(3 downto 0);
        decision_s1     : out    vl_logic;
        sel_initial_s1  : in     vl_logic;
        initial_metric_s1: in     vl_logic_vector(3 downto 0)
    );
end acs1;