xilinx BlockRAM 级联，利用Xilinx原语（非IP Core），更大灵活性-xilinx BlockRAM cascade, using Xilinx primitive (non-IP Core), greater flexibility

本人正在学习vhdl语言，买了套开发板，这些是配套光盘里的内容，非常难得，网上找不到的-I was learning VHDL language, bought a set of development boards, which are compatible CD-ROM's content, and very rare. not online! !