1.从原理图导出管脚分配文件，这个适用于altera xilinx的管脚分配
2.对于DDR的管脚分配，我们可以在MIG IP配置时，直接在IP核配置中输入管脚分配；
在这个界面中，如果事先有准备好的XDC/UCF文件，可用read xdc/ucf导入DDR3的管脚分配文件；同时也可以save pinout把管脚分配保存到新的xdc/ucf文件中；
3.其他的管脚我们可以在xdc文件中手动输入对应管脚，对应管脚的电平；
set_property IOSTANDARD LVCMOS15 [get_ports led]
set_property PACKAGE_PIN Y10 [get_ports led]
4.对BUS，对信号线一定要加上{}；
set_property PACKAGE_PIN A16 [get_ports {adv7393_data[15]}]
set_property PACKAGE_PIN C16 [get_ports {adv7393_data[14]}]
set_property PACKAGE_PIN B17 [get_ports {adv7393_data[13]}]
set_property PACKAGE_PIN A17 [get_ports {adv7393_data[12]}]
set_property PACKAGE_PIN H20 [get_ports {adv7393_data[11]}]
set_property PACKAGE_PIN D16 [get_ports {adv7393_data[10]}]
set_property PACKAGE_PIN F17 [get_ports {adv7393_data[9]}]
set_property PACKAGE_PIN H19 [get_ports {adv7393_data[8]}]
set_property PACKAGE_PIN G17 [get_ports {adv7393_data[7]}]
set_property PACKAGE_PIN G18 [get_ports {adv7393_data[6]}]
set_property PACKAGE_PIN K20 [get_ports {adv7393_data[5]}]
set_property PACKAGE_PIN J19 [get_ports {adv7393_data[4]}]
set_property PACKAGE_PIN L18 [get_ports {adv7393_data[3]}]
set_property PACKAGE_PIN K18 [get_ports {adv7393_data[2]}]
set_property PACKAGE_PIN J17 [get_ports {adv7393_data[1]}]
set_property PACKAGE_PIN K19 [get_ports {adv7393_data[0]}]