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一个实现简单的数字锁相环Verilog代码

library verilog;
use verilog.vl_types.all;
entity id_counter is
    port(
        IDclock         : in     vl_logic;
        reset           : in     vl_logic;
        inc             : in     vl_logic;
        dec             : in     vl_logic;
        IDout           : out    vl_logic
    );
end id_counter;