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I have problem with FPGA JTAG chain please help me

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hamed_sotoudi

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multiple fpga jtag

Hi all
I have problem with JTAG chain. I have one spartan 3 and xcf02 on my board and I designed my board in the way that I can set xcf in the jtag or fpga in the chain or both of them. but when I set xcf in thechain ISE can detect it and when I put FPGA in JTAG ISE can detect it too. but when I set the JTAG in the way that xcf at first and connect its tdo to fpga's TDI and fpga TDO to jtag TDO ISE detect multiple fpgas. and it can not close the chain loop with both of them.what is the problem?

thanks alot.
 

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