此例为FPGA发送数据包到pci9054，用到fifo模块，还有sram模块，比较复杂。应用在pci9054与fpga通讯-This example sends the packet to the FPGA pci9054, use fifo module, as well as sram module, is more complex. Application pci9054 communication with fpga

本人自己经过实践检验的SRAM读写器，用Verilog编写的，可以作为FIFO使用。-I own proven SRAM reader, using Verilog prepared, can be used as a FIFO.

use Sram with ring fifo Spartan-3