question about usb on C6747

Hi，

I want to develop usb firmware based on 6747. But I'm confused about the enumeration process. 

In my opinion，the PC starts  the  enumeration process with sending a setup packet. And I think this setup packet will be stored in endpoint 0 FIFO. But  I find that FIFO0 is 32bit,  while the setup packet is 8byte. So, I'm very confused.

How does the FIFO0 store the setup packet?

Thanks very much!