_primary.vhd

可以在里面修改协议.主要是cmos---fpga--usb(68013a)中除68013a部分的程序

library verilog;
use verilog.vl_types.all;
entity fpga_core is
    generic(
        idle            : integer := 1;
        start           : integer := 17;
        write           : integer := 2;
        W_and_R         : integer := 4;
        write_c         : integer := 8;
        clear           : integer := 0;
        clear_start     : integer := 9
    );
    port(
        clk_54          : in     vl_logic;
        clk_48          : in     vl_logic;
        data_out        : out    vl_logic_vector(15 downto 0);
        datain          : in     vl_logic_vector(7 downto 0);
        \RESET\         : in     vl_logic;
        frame_valid     : in     vl_logic;
        line_valid      : in     vl_logic;
        usb_flag        : in     vl_logic;
        reset           : in     vl_logic
    );
end fpga_core;