本文介绍了在进行FPGA设计，特别是SOC设计时，为了保证顺利移植，重新利用原有程序，而应该注意的一些基本问题和方法，本文由xilinx提供，但对所有的FPGA的使用者都有非常好的借鉴意义。-In this paper, during the FPGA design, especially in SOC design, in order to ensure a smooth transfer, re-use of existing procedures, but should pay attention to some basic questions and methods, this article provided by Xilinx, but for all the FPGA users have very good reference.