To obtain the FPGA delay model described in:
Eddie Hung, Steven J. E. Wilton, Haile Yu, Thomas C. P. Chau and Philip H. W. Leong, "A Detailed Delay Path Model for FPGAs," In Proc. International Conference on Field Programmable Technology (FPT), pages 96-103, 2009.
please contact Eddie Hung at the email address in the paper.