Design And Realization Of Computer Programable Periphery Interface Chip Based On FPGA

With the development of Electronic and EDA (Electronic Design Automatic) technology, Large Scale Integration can be replaced by PLD (Programmable Logic Device) and FPGA (field Programmable Gates Array, which can realize the function of the Programmable Interface Chip and many different Programmable Interface Chips. The computer interface circuit based on the technology of PLD and FPGA not only has the virtue of low volume and low power loss, but also has the unique programmable function, which can realize reconstruction of the function of computer system. Based on the series products of FPGA( FLEX10 ) developed by Altera company, the project design and complete all the functions of PPI (Programmable Parallel Interface chip)8255 with VHDL language under the MAX+PLUSâ…¡. The style of construction description of VHDL language is adopted in the design. According to the function of the Chip the system is separated into two modules, the core and the periphery logic. Thereinto, the core module is divided into PORT A module, PORT B module, PORT C module and Control module. Each bottom module is described byRTL(Registers Transfer Language) and whole module is completed by the graphics input method of MAX+PLUSâ…¡. The function of PPI (Programmable Parallel Interface chip) 8255 is realized through emulating the key waves and testing a chip.