作者：田晓明, 陈怡伶

作者单位：陕西省计量科学研究院, 陕西 西安 710048

关键词：嵌入式系统; 总线接口技术; CF卡存储技术; CPLD编程; 高速存储

摘要：

针对当前现有的CF卡接口电路存在接口复杂、稳定性不高、存储速度缓慢等缺点,通过深入研究ARM处理器AT91RM9200的外部总线接口(EBI)及CF卡、CPLD的工作原理,设计了新的CF卡接口电路。新的CF卡接口电路中采用了CPLD来代替一般CF卡接口电路中的双向缓冲器、与非门等所有逻辑器件,通过现场对CPLD编程来实现不同的逻辑功能。实验表明,该电路更加简单、灵活、稳定、高速,对接口电路的设计有重要的参考价值。

Memory technology of CF card based on ARM embedded system

TIAN Xiao-ming, CHEN Yi-ling

Shaanxi Institute of Metrology, Xi'an 710048, China

Abstract: In consideration of the disadvantages of the currently available CF card interface circuit, such as complex interface circuit, instability, low-speed storage and so on, a new interface circuit was designed on the basis of deep research work on ARM processors, the external bus interface, the CF card and CPLD working principle. In the new CF card interface circuit, the CPLD was used to replace all the logic devices, including bi-direction buffers and NAND gate, in general CF card interface circuit. Thus, it can realize different logic functions through on-site programming of CPLD. The experimental results showed that the new interface circuit is more simple, flexible, stable and faster. It is of great value for the design of interface circuit.

Keywords: Embedded system; Bus interface technology; CF card storage technology; CPLD programming; High-speed storage

2010, 36(3): 86-88  收稿日期: 2009-9-7;收到修改稿日期: 2009-12-15

基金项目: 

作者简介: 田晓明(1981-),男,陕西绥德人,硕士,专业方向为嵌入式系统应用。

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