a8255top.vhd

用VHDL语言实现可编程并行接口芯片8255

-- Altera Microperipheral Reference Design Version 0802
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--
--  FILE NAME   :   a8255top.vhd

--  PROJECT     :   Altera A8255 UART
--  PURPOSE     :   This file contains the entity and architecture 
--                  for the A8255 top level model containing the
--                  A8255 model and its testbench
--
--
--Copyright