说明：  嵌入式系统相关：周立功EasyArm2131开发板原理图的真正Protel版本（绝非无耻的PDF版本！），网上如何找都没有的，本人也是深受其害故只好对着PDF的图一条条线、一个个元件慢慢画，由于是Altium Designer制作的，考虑到使用Protel 99SE的人故转换格式为通用的.sch，同时将原SchDoc文件一同附上（Protel DXP也可打开），方便对嵌入式Arm感兴趣的朋友节约那几百大洋，同时锻炼自己的印制板制作能力。
(Embedded systems: Week Ligong EasyArm2131 development board Protel schematic diagram of the real version (not the PDF version of shameless!), On-line how to get there was none, and I was a victim of it had to face a PDF of the map lines, components one by one slowly painting, because it is produced by Altium Designer, Protel 99SE to take into account those who use it as a generic format conversion. sch, at the same time the original document together SchDoc attach (Protel DXP also be open) for embedded Friend interested Arm saving it hundreds of the ocean, at the same time exercise their own PCB production capacity.)