哪些寄存器与传输速度有关

马克斯分组大小是USB主机控制器使用的描述符值，以理解它应该如何打包大量数据。该值只在FX2的计算机端，在USB线的另一端。FX2本身并不太在意描述符中的值。EXBCL/H是8051固件使用的寄存器，用来询问从主机到达多少数据，或者向主机指示在端点缓冲器中已经提供了多少数据。当您在内部读取或写入端点缓冲器时，使用这些寄存器。自动长度寄存器允许FX2从FX2的设备侧自动打包大量数据。只有当你有一个外部设备将字节写入FX2从FIFO或GPIF中时才是重要的。我强烈建议找到FX2LP的技术参考手册和阅读第8章（访问端点缓冲区）和9（Slave FIFOs）-他们将解释所有这些寄存器是什么。



     以下为原文
          Max Packet Size is a descriptor value that is used by the USB Host Controller to understand how it should packetize large amounts of data. The value only matters to the computer-side of the FX2, at the other end of the USB cord. The FX2 itself doesn't really care too much about the value in the descriptor.   
   
EPxBCL/H are registers that are used by 8051 firmware to either interrogate how much data arrived from the host, or to indicate to the host how much data has been provided in the endpoint buffer. These registers are used when you're internally reading or writing to the endpoint buffers.   
   
Auto in length registers allow the FX2 to automatically packetize large amounts of data from the device-side of the FX2. It only matters if you have an external device writing bytes into the FX2's Slave FIFOs or GPIF.   
   
I highly recommend finding the FX2LP's Technical Reference Manual and reading chapters 8 (Access to Endpoint Buffers) and 9 (Slave FIFOs) - they will explain what all of those registers are for.   

谢谢你的回复，我将在两天内详细描述。到时我希望你能给我一些建议。



     以下为原文
          Thank you for your reply,I will describe the details in two days.By then I hope you could give me some suggestions.