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按照模块化和标准化的要求,提出用CPLD和双口RAM来实现一种通用的寄存器基VXI接口电路的设计方案,使之满足基于VXI总线高频地波雷达所有模件的接口要求.具体描述了该接口的设计方法、主要的逻辑及时序关系,采用有限状态机并利用VHDL语言和原理图输入的混合设计成功实现了“双向中断、全双工”的块数据传输方式.它具有通信速率高、灵活性好、调试方便等特点.实际运行表明,该接口电路工作正常可靠.
In accordance with the requirements of modularization and standardization, a general register-based VXI interface circuit design using CPLD and dual-port RAM is proposed to meet the requirements of all the modules based on VXI bus high frequency ground wave radar. The design method of the interface, the main logic and the timing relationship, the use of finite state machine and the use of VHDL language and schematic input hybrid design successfully achieved the “two-way interrupt, full duplex” block data transmission method. It has High communication speed, good flexibility, convenient debugging, etc. The actual operation shows that the interface circuit works normally and reliably.