说明：  ucos 下的 lxt971alc网络物理层接口芯片的驱动。文件里的说明已经很详细了。用户可以先了解一下lxt971alc芯片的datasheet。 驱动编写，可参照此源程序。
(uCOS lxt971alc network under the physical layer interface chip driver. Document has a very detailed description of the. Users can learn about lxt971alc chip datasheet. Driver preparation, reference may be made of this source.)