The crus of Southern Rhône question

Are all 18 AOPs from the Southern Rhône considered crus - or is it only the 9 centered AOPs (CdP, Lirac, Tavel, Gigondas, Vacqueyras, Beaumes de Venise, Rasteau, Cairanne and Vinsobres) that are of cru-status? If so, what is the difference between the crus and the "non-cru"-AOPs of the Southern Rhône? 
I was under the impression that all 18 AOPs were considered crus, similar to the AOPs of Beaujolais where all 10 AOPs are crus - so what is correct? 

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