双口RAM在PCI总线与AVR接口设计中的应用  

Application of Dual-port RAM in Design of Interface between PCI Bus and AVR

作　　者：邓江涛 傅煊[2] 

机构地区：[1]陕西省宝鸡市150信箱,陕西宝鸡721000 [2]中国工程物理研究院电子工程研究所,四川绵阳621900

出　　处：《现代电子技术》2011年第18期97-100,共4页Modern Electronics Technique

摘　　要：为了提高PCI总线与AVR单片机之间的数据传输速度,利用双口RAM通过共享的方式实现PCI总线与AVR单片机之间的高速数据交换。利用有限状态机方法将PCI接口芯片局部端逻辑转换为双口RAM读写控制信号和地址数据信号,并通过仿真工具Modelsim Se对接口电路进行了验证,得出的仿真波形符合要求;利用乒乓操作方法实现PCI接口芯片和AVR单片机交替读/写数据存储区,有效提高了PCI总线与AVR单片机之间的数据传输速度。实践证明该设计方法是解决高低速设备的传输瓶颈问题的有效途径。In order to improve the speed of data transmission between PCI bus and AVR microcontroller, the high-speed data exchange between PCI bus and AVR microeontroller is realized by the dual-port RAM and sharing mode. A way of finite state machine （FSM） is used in this system to convert the PCI interface chip＇s local logic signal into read-write control signal andaddress data signal. The interface current is validated by the simulation tool ModelSim SE. The simulated waveform ob- tained is in accordance with the requirement. A method of Ping-Pong Operation （PPO） is used in this system to effectively im- prove the speed of data transmission between PCI bus and AVR microcontroller by alternately read and write data storage are- a. Practice has proved that the design method of this paper is an effective method of solving the bottleneck problem of data transmission between high-speed equipment and low-speed equipment.

关 键 词：双口RAM AVR CPLD 状态机 乒乓操作 

分 类 号：TN911-34[电子电信—通信与信息系统] TP273.5[电子电信—信息与通信工程]