_primary.vhd

：两人乒乓球赛 Requires: D2SB and DIO4 with VGA monitor and PS2 Keyboard

library verilog;
use verilog.vl_types.all;
entity disp_ram is
    port(
        addra           : in     vl_logic_vector(14 downto 0);
        addrb           : in     vl_logic_vector(14 downto 0);
        clka            : in     vl_logic;
        clkb            : in     vl_logic;
        dina            : in     vl_logic_vector(7 downto 0);
        douta           : out    vl_logic_vector(7 downto 0);
        doutb           : out    vl_logic_vector(7 downto 0);
        wea             : in     vl_logic
    );
end disp_ram;