.动态扫描显示程序：libraryieee;useieee.std_logic_1164.all;entitydtsm_xsisport(clk:instd_logic;B14,B13,B12,B11,B10,B9,B8,B7,B6,B5,B4,B3,B2,B1:instd_logic_vector(3downto0);x:outstd_logic_vector(6downto0);led_select:outstd_logic_vector(13downto0));end;