BULKTranfer

usb2.0对于我常用的有control,BULK.

其中bulk给我体会最深的一句是:(摘自TRMpage164) 

In synchronous mode (IFCONFIG.3 = 0), data on the FD bus is written to the FIFO (and the FIFO pointer is incremented) on each rising edge of IFCLK while SLWR is asserted. 

cypress的资料也很全面,最最重要的是TRM,另外他的官网上有很多专题性的AN.比如AN45471_Vendor Command Design Guide for FX2LP.pdf