基于VHDL的四通道12位SXZ(D/A)模块接口设计

分析了基于8255设计的SXZ（D/A）接口电路，并简述了VHDL语言的应用特点。针对基于8255的接口电路，存在占用I/O端口资源和使用分立元件多， PCB板面积较大等缺点，采用VHDL设计了一种四通道的12位接口电路，并给出了VHDL语言描述，通过MAXPLUS+Ⅱ10.0进行了电路仿真。实际应用表明，采用VHDL 设计的接口电路具有更好的性价比，尤其是尺寸小，易于维护和抗干扰性强。  
Design of Interface Circuit with four Accesses for SXZ(D/A) Module with 12 bit Based on VHDL

Qiu Kai Chen Tianru
The Air Engineering Institute of AFEU ,Xi'An 710038

Abstract: The interface circuit of SXZ(D/A) module with PC on 8255 is first analyzed. For some disadvantages of many I/O ports and components used in the interface circuit on 8255 , a interface circuit with four accesses on VHDL is designed, when the description on VHDL and simulation on MAXPLUS+Ⅱ10.0 are given . The application shows the interface circuit on VHDL has better cost performance, especially as small size, easy maintenance and strong resistance to disturbance.
Key words: VHDL；SXZ(D/A) Converter；MAXPLUS+Ⅱ10.0