On the A320 FCU there is a list of speed limits for (5) flap/slat extension positions- 1, 1+F, 2, 3, FULL.  The control for deploying slats/flaps has only (4) positions- 1, 2, 3, FULL (plus 0 for clean).  How do you map the (5) positions to the control ?  Positions 1 and 1+F seem to be the key.  I would appreciate an explanation on this issue.

That’s a logic thing and you can’t pick which one happens from what I believe. A certain set of parameters determines what happens in the FLAP 1 position.

The FBW manual has a good summary of the flaps logic:

https://docs.flybywiresim.com/pilots-corner/a32nx-briefing/flight-deck/pedestal/flaps/

1+F means slats and flaps deployed (mostly takeoff), while 1 is slats only in flight before flaps deploy at 2. So for the first detent you have two possible configs depending on the phase of flight (1+F or 1), therefore there are speed limits for 5 possible configs but only 4 detents for the lever since position 1 is for both 1+F and 1.

Thank you both, got it.