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CY7C68013A, do i need to read whole FIFO?

Hi everyone.
I'm working with CYC68013A chip using slave FIFO mode and bulk transfer.ezusb.sys driver is used as a device driver in PC.
When PC sends data to device, for example 2 bytes i fill additionally to 512 bytes packet size. Bud does chip needs to read all 512 bytes from FIFO or only two bytes can be read?
Also i need a documentation on ezusb.sys. Some thigs i don't understand. Does ezusb.sys has internal buffer for a packets and what happens to packets if device send them to PC but software does not read them using IOCTL_EZUSB_BULK_READ command?
Thanks in advance.