我在使用Protel DXP画完MP3电路图后，执行编译操作（ERC检查），得到许多的显示错误的信息， 

可是我看不懂，不知错在何处。我找了很多的书都没有说错误信息的。着急啊！

请高手给看一下，我的问题到底出在哪里？

万分的感谢！  

具体信息如下：

Class      Document               Message                             

[Warning] AUDIO.SCH  Extra Pin R509-1 in Normal of part R509 
[Warning] AUDIO.SCH  Extra Pin R509-2 in Normal of part R509 
[Warning] AUDIO.SCH  Extra Pin R509-1 (Inferred) in Alternate 1 of part R509 
[Warning] AUDIO.SCH  Extra Pin R509-2 (Inferred) in Alternate 1 of part R509 
[Warning] AUDIO.SCH Extra Pin R511-1 in Normal of part R511 
[Warning] AUDIO.SCH  Extra Pin R511-2 in Normal of part R511 
[Warning] AUDIO.SCH  Extra Pin R511-1 (Inferred) in Alternate 1 of part R511 
[Warning] AUDIO.SCH  Extra Pin R511-2 (Inferred) in Alternate 1 of part R511 
[Warning] AUDIO.SCH  Extra Pin R520-1 in Normal of part R520 
[Warning] AUDIO.SCH  Extra Pin R520-2 in Normal of part R520   
[Warning] AUDIO.SCH  Extra Pin R520-2 in Normal of part R520 
[Warning] AUDIO.SCH Extra Pin R520-1 (Inferred) in Alternate 1 of part R520 
[Warning] AUDIO.SCH  Extra Pin R520-2 (Inferred) in Alternate 1 of part R520 
[Warning] AUDIO.SCH  Extra Pin R521-1 in Normal of part R521 
[Warning] AUDIO.SCH  Extra Pin R521-2 in Normal of part R521 
[Warning] AUDIO.SCH  Extra Pin R521-1 (Inferred) in Alternate 1 of part R521 
[Warning] AUDIO.SCH Extra Pin R521-2 (Inferred) in Alternate 1 of part R521 

[Warning] AUDIO.SCH 
[Warning] AUDIO.SCH  Extra Pin R517-2 (Inferred) in Alternate 1 of part R517 

[Warning] POWER.SCH  Global Power-Object 3.3V at 73000000,49000000has been reduced to local level by presence of port at 810,490 
[Warning] POWER.SCH  Sheet contains duplicate ports Port 3.3V at 810,490 and 770,330                                            
[Warning] POWER.SCH  Sheet contains duplicate ports Port 3.3V at 770,330 and 160,630                                            
[Warning] POWER.SCH  Sheet contains duplicate ports Port USB5V at 330,490 and 160,610                                        
[Warning] MP3.SCH  Unconnected Sheet Entry POWER-3.3V(Passive) at 190,1390                                                        
[Warning] MP3.SCH  Unconnected Sheet Entry AUDIO-3.3V(Passive) at 60,1380                                                       
[Warning] MP3.SCH  Unconnected Sheet Entry AUDIO-AGND(Passive) at 60,1360                                                         
[Warning] MP3.SCH  Unconnected Sheet Entry POWER-GND(Passive) at 190,1370                                                       
[Warning] MP3.SCH  Unconnected Sheet Entry AUDIO-LRCLK(Passive) at 160,1420                                                    
[Warning] MP3.SCH  Unconnected Sheet Entry AUDIO-MCLK(Passive) at 160,1400                                                        
[Error] MP3.SCH  Net NetU2_8 contains floating input pins (Pin U2-8)                                                               
[Warning] MP3.SCH Unconnected Pin U2-8 at 510,140                                                                                
[Error] MP3.SCH Net NetU2_10 contains floating input pins (Pin U2-10)                                                            
[Warning] MP3.SCH  Unconnected Pin U2-10 at 660,150                                                                            
[Warning] MP3.SCH  Unconnected Sheet Entry AUDIO-SCLK(Passive) at 160,1380                                                        
[Warning] MP3.SCH  Unconnected Sheet Entry AUDIO-SDATA(Passive) at 160,1360                                                   
[Warning] MP3.SCH  Unconnected Sheet Entry POWER-USB5V(Passive) at 190,1410                                                  
[Warning] MP3.SCH  Unconnected Sheet Entry POWER-VLCD(Passive) at 190,1350                                                       
[Warning] MP3.SCH  Nets Wire P1.6 has multiple names (Net Label P1.6,Net Label SCL)                                            
[Warning] MP3.SCH  Nets Wire P1.7 has multiple names (Net Label P1.7,Net Label SDA)                                            
[Warning] POWER.SCH  Sheet contains duplicate ports Port 3.3V at 160,630 and 770,330                                           
[Warning] POWER.SCH  Sheet contains duplicate ports Port 3.3V at 770,330 and 810,490                                           
[Warning] POWER.SCH  Sheet contains duplicate ports Port USB5V at 160,610 and 330,490                                       
[Error] AUDIO.SCH  Net NetU5_3 contains floating input pins (Pin U5-3) 
[Error] AUDIO.SCH  Net NetU5_4 contains floating input pins (Pin U5-4) 
[Error] AUDIO.SCH  Net NetU5_1 contains floating input pins (Pin U5-1) 
[Error] MP3.SCH 3.3V contains Output Pin and Power Pin objects (Pin U5-7,Pin U2-16) 
[Warning] MP3.SCH  Net TXD has no driving source (Pin U1-26,Pin U2-11) 
[Warning] MP3.SCH  Net RXD has no driving source (Pin U1-25,Pin U2-12) 
[Warning] AUDIO.SCH  Net NetU5_3 has no driving source (Pin U5-3) 
[Warning] AUDIO.SCH  Net NetU5_4 has no driving source (Pin U5-4) 
[Warning] MP3.SCH Net NetJ1_2 has no driving source (Pin J1-2,Pin U2-13) 
[Warning] MP3.SCH  Net NetU2_8 has no driving source (Pin U2-8) 
[Warning] MP3.SCH  Net NetU2_10 has no driving source (Pin U2-10) 
[Warning] AUDIO.SCH  Net NetU5_1 has no driving source (Pin U5-1) 
[Warning] AUDIO.SCH  Net NetC521_1 has no driving source (Pin C521-1,Pin R517-1,Pin R518-2,Pin U6-6) 
[Warning] AUDIO.SCH Net NetC526_1 has no driving source (Pin C526-1,Pin R511-2,Pin R520-1,Pin U6-3,Pin U6-5) 
[Warning] AUDIO.SCH  Net NetC528_1 has no driving source (Pin C528-1,Pin R509-2,Pin R510-1,Pin U6-2) 
[Error] MP3.SCH  Duplicate Net Names Wire 3.3V                                                                               
[Error] MP3.SCH  Duplicate Net Names Wire USB5V                                                                               

//////////////////////////////////////////////////////////////////////

经过漫长的摸索，我的文件编译操作终于通过了。大致有几类错误,
现总结如下：
一， [Warning] AUDIO.SCH  Extra Pin R509-1 in Normal of part R509
     [Warning] AUDIO.SCH  Extra Pin R509-2 in Normal of part R509
     [Warning] AUDIO.SCH  Extra Pin R509-1 (Inferred) in Alternate 1 of part R509
     出现此类警告的原因 ：在 AUDIO.SCH文件中的所有电阻封装不可用。
     解决的办法：对  AUDIO.SCH文件中的所有电阻从新调换。
    
二， [Warning] POWER.SCH  Global Power-Object 3.3V at 73000000,49000000has been reduced
             to local level by presence of port at 810,490
     出现此类警告的原因 ：在POWER.SCH文件中电源标号Global Power-Object 3.3V和端口port 重复定义.
     解决的办法：对 POWER.SCH 文件中去掉多余的电源标号Global Power-Object 3.3V。
    
三,  [Warning] POWER.SCH  Sheet contains duplicate ports Port 3.3V at 810,490 and 770,330                                            
     [Warning] POWER.SCH  Sheet contains duplicate ports Port 3.3V at 770,330 and 160,630                                            
     [Warning] POWER.SCH  Sheet contains duplicate ports Port USB5V at 330,490 and 160,610 
     出现此类的警告的原因 ：在POWER.SCH文件中网络标号 ports Port 3.3V 重复定义.
     解决的办法：对 POWER.SCH 文件中去掉多余的网络标号 ports Port 3.3V。
    
四,  [Error] MP3.SCH  Net NetU2_8 contains floating input pins (Pin U2-8)
     出现此类错误的原因 ：在MP3.SCH文件中集成元件U2包含有浮空的输入引脚.
     解决的办法：对 POWER.SCH 文件中集成元件U2包含有浮空的输入引脚8(此脚不用)放置忽略标记。
    
上述的总结仅我个人的理解,若有错误,敬请指正!
 谢谢!

呀，我也用DXP。一直没注意到空引脚的问题啊~~晕

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