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I understood pretty good what's your problem. The JTAG side connection can't be simply extended. As you gave not a single reason, why you didn't consider to extend the USB side, I just reported my solution for a similar problem.
In other words: When extending the JTAG interface (with acceptable speed), there must be a driver near to the board connector. Why not using the USB Blaster as the driver?
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The board is buried rather deep inside a large case full with other boards. The configuration lines were taken through the motherboard to the connector of the case. Besides, the USB blaster is planned to be made a part of a special test equipment that connects to the case through a proprietary connector, and we want to lead the configuration lines through this connector. The total distance can reach a few meters.
Honored Contributor
