USRP2, FPGA speed grade

Hi,

what is the speed grade of XC3S2000 FPGA on USRP2 board?

Thanks,
Malihe

all project properties can be found here:

http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/repository/revisions/master/entry/fpga/usrp2/top/u2_rev3/Makefile.udp