说明：  XILINX 与 ALTERA 两家FPGA的比较,其中涉及了资源\速度\型号\性能等,比较时编译软件都采取了较多设置,可以保证正确性.
(XILINX and ALTERA FPGA comparison of two, which involves a resource \ speed \ models \ performance, etc., when compared to compiled software have taken more settings, you can guarantee correctness.)