Since bulk transfer bandwidth of the host is unstable, the universal serial bus (USB) 3.0 hyperspectral data transfer system can only achieve a data transfer rate of about 30 MBps which is less than one-fifteenth of USB 3.0 theoretical transfer rate of 5 Gbps. For aerial hyperspectral imager, data transfer system is required to meet different frame rates of detector for different speed-to-height ratios. In this paper, we propose a high-speed and adjustable synchronous transfer system. The USB 3.0 peripheral controller uses synchronous first in first out (FIFO) and automatic direct memory access (DMA) to achieve the highest data transfer bandwidth. The USB acquisition software collects a data block in every fixed time interval. The size in bytes of every data block must be an integer multiple of the maximum data packet payload size, which is a necessary condition for using automatic DMA and bulk transfers. The data transfer rate of the system could be adjusted by directly changing the data block size and acquisition time interval. The experimental results show that the synchronous transfer mechanism could facilitate the 100-MBps error-free and high data transfer bandwidth application on a hyperspectral data processing system.

中文翻译：

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基于USB 3.0外设控制器的高速可调同步数据传输系统的研究与应用

由于主机的批量传输带宽不稳定，通用串行总线（USB）3.0高光谱数据传输系统只能实现约30MBps的数据传输速率，不到USB 3.0理论传输速率5Gbps的十五分之一。对于航空高光谱成像仪，需要数据传输系统来满足不同速高比的探测器的不同帧率。在本文中，我们提出了一种高速可调的同步传输系统。USB 3.0 外围控制器使用同步先进先出 (FIFO) 和自动直接内存访问 (DMA) 来实现最高的数据传输带宽。USB 采集软件在每个固定的时间间隔内采集一个数据块。每个数据块的字节大小必须是最大数据包有效负载大小的整数倍，这是使用自动 DMA 和批量传输的必要条件。可以通过直接改变数据块大小和采集时间间隔来调整系统的数据传输速率。实验结果表明，同步传输机制可以促进高光谱数据处理系统上100-MBps无差错和高数据传输带宽的应用。