jtag找不到芯片是什么问题？

hanksen

1. Instruction Length set to 5
   
2. 
   
3. CPU Chip ID: 11111111111111111111111111111111 (FFFFFFFF)
   
4. *** Unknown or NO CPU Chip ID Detected ***
   
5. 
   
6. *** Possible Causes:
   
7.     1) Device is not Connected.
   
8.     2) Device is not Powered On.
   
9.     3) Improper JTAG Cable.
   
10.     4) Unrecognized CPU Chip ID.
    
11. Probing bus ... Done

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出来这个提示问题出在哪？是JTAG线的问题么？

likexiang

一般情况下线接的不对会出现找不到CPU

coolbill

线太长，5CM试下

hanksen

搞定了，线缆焊接问题