I am using a ProASIC3E PQ208 FPGA and Libero tool to write the vhdl code and program the board on which the FPGA is soldered. When I try to open Libero again to program file, it starts the synthesis again. The old synthesis file exists and I have not made any changes, but still there is place and route operation going on everytime I try to program the device .
I have never faced this issue when generating bitstream in Xilinx Vivado. The Actel documentation is also not that great so I could not figure out why this was happening.