OMAP-L138 – EMIFA Turnaround phase implementation

Hello,
OMAP-L138 EMIFA controller executes Turnaround phase prior to the operation.  

Try as I may I cannot figure what the rationale behind is, the more so that Technical Reference Manual  combines TA (leading delay) with a R_HOLD (trailing delay) as shown below.

TRM page 830:
If more turnaround cycles are required than can be programmed into the TA field, additional cycles can be added to the R_HOLD field to compensate.

May I ask for clarification?

Many thanks,
Milan