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USB(十五)2022-04-14
2022-07-07 21:50:00 【晓晓暮雨潇潇】
FX3芯片FPGA开发之二读写时序
1.时序参数
1.1时序参数
AN65974文档中明确了操作GPIF II接口时的时序参数,现截图如下,其中图一为同步从设备读序列,图二为同步从设备写序列,图3是同步ZLP写周期时序,图4是具体的参数值。应该注意,这是Cyusb3014芯片的时序要求,与外部控制器是什么无关。另外要注意,PCLK信号是由外部控制器传递给Cyusb3014的时钟,而不是它自身的。可以看到,这几张图除了描述时序参数外,也指出了读写操作时序,本文后面将作为独立小节分析。
图1 同步从设备读序列
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