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Registered: ‎06-09-2009

Spartan-3E Starter Kit Disable USB-JTAG

I'm using a Spartan-3E Starter Kit for the xcs500e256 Device. I want to connect 2 Boards within 1 JTAG-Chain.

So I've made a cable to connect the Pins from the FX2 connector of one Board to the J28 Connector of the other board.

Like this:


FX(Board 1)        J28 (Board 2)

TMS-B     ->       TMS

TDO-XC2C  ->       TDI

TDO-FX2   <-       TDO

TCK-B     ->       TCK

GND       ->       GND

JTSEL     <-       VCC


So I want' to use the USB-JTAG Interface of Board 1 and include Board 2 into this JTAG jain. But it doesn't work properly.

It looks like the jtag-chain is broken. (I get Data on TDO-XC2C but no data on TDO-FX2)

What am i doing wrong?

Does i have to disable the USB-JTAG Interface on Board2? How?


thanks for help




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Registered: ‎09-11-2012

Well, looks like we have the same problem. Only 3 years apart :P ... Is there anyone who actually used the Spartan 3E starter kit to program another FPGA on a second board? Any suggestions on how to make this work?

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