OMAP-L138 Async EMIFA Turnaround phase

Hello,
OMAP-L138 Reference Manual says that TA precedes the Async EMIFA operation.

Could you please explain in plain English how this feature helps slow down access to a slow peripheral?

If TA cases leading delay, then I suspect SW cannot assign a prolonged TA to the peripheral with slow OE-to-databus-High-Z response time. What am I missing here? 

Many thanks,
Milan