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AM1808 NAND FLASH - CS mapping

In section 2.5.6.8 of the   , it states:

"the EMIFA does not support NAND Flash devices that require the chip select signal to remain low during the tR time for a read. One way to work around this limitation is to use a GPIO pin to drive the CE signal of the NAND Flash device."

Can I use any GPIO pin, even one that is multiplexed, but unused, with the EMIFA interface?

Thanks.

Luc