| 大概知道为什么设置成0x80了,是不是这一位就是当skip用的,因为不可能出现128大小的buffer;而ARM的意思相当于舍弃当前数据,装载需要数据 If the SKIP bit is set to ‘1’, the just-received OUT packet
 is not committed to the output FIFO for transfer to the
 external logic; instead, the packet is ignored, its buffer is
 immediately made available for the next OUT packet,
 and the output FIFO (and external logic) never even
 ‘knows’ that it arrived.
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