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标题：基于FPGA设计EnDat接口绝对式编码器数据读出方案 |
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作者：翟天祺，李建春，吴明剑 |
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| 2018年第9期 访问次数：422次 |
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摘要：为处理采用EnDat通信协议的双向数字接口信号，基于Altera公司CycloneⅢ系列的FPGA芯片EP3C40Q240C8作为主控芯片及德国Heidenhain(海德汉)公司生产的高精度绝对式光电编码器ECN1113设计了编码器的信号处理系统。首先介绍了EnDat接口的特性及EnDat接口与后续电路的连接方法，接着描述了EnDat协议的通信过程，然后详述了EnDat协议的Verilog设计实现流程及方法，最后展示了实验结果。结果表明，可以通过FPGA对基于EnDat协议的绝对式编码器实现准确的控制及数据读取。该设计已在交流伺服控制系统中获得了成功的应用。
关键词：FPGA；Endat；绝对式编码器
Abstract: In order to deal with the bidirectional digital interface signal using EnDat communication protocol, based on the FPGA chip EP3C40Q240C8 of Altera companys Cyclone series as the main control chip and the high precision absolute photoelectric encoder ECN1113 produced by the German Heidenhain company, the signal processing system of the encoder was designed. First, the characteristics of the EnDat interface and the connection method of the EnDat interface with the followup circuit were introduced. Then the communication process of the EnDat protocol was described. After that，the Verilog design implementation process and method of the EnDat protocol were described, and the experimental results were displayed at the end. The results show that FPGA can achieve accurate control and data reading for EnDat based absolute encoder. The design has been successfully applied to AC servo control system.
Key words: FPGA；Endat；absolute encoder
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