说明：  用VHDL实现从以太网到并行数据以及从并行数据到以太网的HDLC成帧解帧.附详细代码说明,方便阅读.可方面移植到Altera及Xilinx等厂家芯片,是做基于FPGA的以太网设计的好资料
(Achieved using VHDL and parallel data from the Ethernet to parallel data from the HDLC framing solution to Ethernet frames. Attached detailed code instructions, easy to read. Can be ported to Altera and Xilinx areas such as chip manufacturers are doing to FPGA-based very good information network design)