Fairly sure, this is what it says at the start of PaR
par -w -intstyle ise -ol high -mt off platform_top_map.ncd platform_top.ncd
Constraints file: platform_top.pcf.
Loading device for application Rf_Device from file '6slx150.nph' in environment C:\EDA_Tools\Xilinx\14.7\ISE_DS\ISE.
"platform_top" is an NCD, version 3.2, device xc6slx150, package fgg484, speed -2