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error when downloading configuration

Altera_Forum
Honored Contributor II
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Hi, all: 

I meet with a problem. 

Error occurs when I am downloading the .sof file in jtag mode with usb-blaster.  

Error Message: Error: Can't access JTAG chain, Error: Operation failed  

Two print circuit boards(PCB) are used. One is stratix II ep2s60 development board and another is Peripheral Circuit of the stratix board. They are connected though Pin header. I have found that error occurs when the boards are connected. Once they are disconnected, downloading .sof file will success.  

And I am sure the corresponding places of pins for jtag on the development board are not used in another PCB. 

What's wrong with my project? and what can I do then ? My project requires both of the PCBs, otherwise the system cannot work correctly!  

 

could anyone help!
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