基于xilinx fpga的vhdl液晶程序

vhdl液晶程序LIBRARYIEEE;USEIEEE.STD_LOGIC_1164.ALL;USEIEEE.STD_LOGIC_ARITH.ALL;USEIEEE.STD_LOGIC_UNSIGNED.ALL;ENTITYLCDISPORT(CLK:INSTD_LOGIC;X1,X2,X3:ININTEGERRANGE1TO9;RS,RW,CS1,CS2,E:OUTSTD_LOGIC;Q:BUFFERSTD_LOGIC_VECTOR(7DOWNTO0));ENDLCD;