reading data from a FT245BM

Hello,
I am totally new to USB (well, at least to the darkness inside ;-(
I have to read data from an FPGA located behind the TD245. My question is
: who begins the data transfer? if I program the FPGA to read say 1k bytes,
does the FPGA have to begin filling up the FIFO and suppose that the data
will be caught on time by the DLL, or does the FPGA have to track the TXE
("transmit enable") and respond each time?
Sorry for the beginner's status... and many many thanks for the future
replies :-)
Jean Louis


.

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