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Virtex-6 - MGT - Can you configure MGT I/Os as GPIOs?
For a Virtex-6 device, can the MGT pins be used as GPIOs (general purpose I/O)?
No, For a Virtex-6 device you can bring a clock on the refclk pins to drive fabric but that is all.
You cannot use TX or RX pins without using the entire GT.