Chip selects are sometimes active-high rather than active-low.

片选有时是高有效而不是低有效。

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And it introduces the theory of the design, selects specific chip, introduces the hardware of the channel, and brings forward the method of designing USB firmware, driver, and application.

介绍了该设计的原理，并选择了具体的元器件型号，给出了该通道的硬件结构图。并进一步给出了USB固件程序、驱动程序以及上层应用程序的设计方法。

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And it introduces the theory of the design, selects specific chip, introduces the hardware of the channel, and brings forward the method of designing USB firmware, driver, and application.

介绍了该设计的原理，并选择了具体的元器件型号，给出了该通道的硬件结构图。并进一步给出了USB固件程序、驱动程序以及上层应用程序的设计方法。

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