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USB(十四)2022-04-12
2022-07-07 21:50:00 【晓晓暮雨潇潇】
FX3芯片FPGA开发之一
1.内容简介
从本节开始,进入到FPGA端的介绍,即固件与FPGA通过GPIF II接口的交互。学习本节内容之前,应对Cyusb3014芯片原理的部分比较熟悉,包括固件中的各术语概念,以及数据流中各部分的映射即配置。
关于这个部分,目的是使固件与FPGA的数据传输能够正确进行,同时包括上行数据和下行数据。为达到这一目的,准备介绍的内容如下:①明确固件的配置。举个简单例子,GPIF II Designer中可以设置引脚的名称,也可以设置不同状态以及状态切换的条件,因此不同的固件配置应该适配不同的逻辑代码,明确固件配置就是表明我的全部的FPGA相关理论是基于这个特定配置的。②时序分析,包括了读写时序分析,以及芯片原理部分提及的短包,零包,并介绍短包、零包的应用以及本质。③分析一些现象,例如缓冲区的切换;pclk时钟反相180°的原因;官方AN65974xilinx代码的错误等。④介绍标志的使用,固件原理提到了有三种标志,具体使用时应该怎么操作,有哪些注意事项?⑤逻辑开发中,一些编程经验的分享。以上内容均会穿插在文章中体现,阅读时注意对号入座。
2.固件配置
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