usb1_funct Map Error

Hi,
  I have download the USB1_funct IP  from http://www.opencores.org/projects.cgi/web/usb1_funct/overview
 
 and tried to download it on Spartan 3E but I have Error Map

  I looked at the Map Report and I got this :
 

Number of bonded IOBs:             306 out of     232  131% (OVERMAPPED)

and this Error  :
ERROR:Pack:18 - The design is too large for the given device and package.
   Please check the Design Summary section to see which resource requirement for
   your design exceeds the resources available in the device.


Can anyone help how to fix it