LPC2141_USB interface

Hi all,

I want to use the USB feature provided in the LPC2141.
I want to use a pen-drive for collecting information from the hardware-board.
Is there need of any additional hardware in between my controller and USB port?? or can i use it directly???

I am not able to gather any useful information from the user manual of lPC 2141.

Please guide me on what to do...and how to approach the topic.........

pavan