_primary.vhd

使用Libero提供的异步通信IP核实现UART通信

library verilog;
use verilog.vl_types.all;
entity Rx_async is
    generic(
        RX_FIFO         : integer := 0;
        CUARTO01        : integer := 0;
        CUARTI01        : integer := 1;
        CUARTl01        : integer := 2
    );
    port(
        clk             : in     vl_logic;
        baud_clock      : in     vl_logic;
        reset_n         : in     vl_logic;
        bit8            : in     vl_logic;
        parity_en       : in     vl_logic;
        odd_n_even      : in     vl_logic;
        read_rx_byte    : in     vl_logic;
        clear_parity    : in     vl_logic;
        rx              : in     vl_logic;
        overflow        : out    vl_logic;
        parity_err      : out    vl_logic;
        clear_parity_en : out    vl_logic;
        receive_full    : out    vl_logic;
        rx_byte         : out    vl_logic_vector(7 downto 0);
        fifo_write      : out    vl_logic
    );
end Rx_async;