FCOM Bulletin
Hi Delta Papa,
You can also look in FCOM Bulletins 804-1 IAE V2500 N1 mode. On page 5 of the bulletin there is a graph that gives you comparison between thrust available for different modes. Since there is a significant loss of thrust in N1 rated mode, there is a significant performance penalties for take off as well.
EPR mode: everything is available.
N1 rated mode: On ground GO item but performance penalties and auto thrust is lost.
N1 Unrated mode: On ground NO-GO item, in flight you have to refer to FCOM 3.05.05 Thrust Ratings for maximum N1 allowed. This is the only mode where you can over boost or red line the engine.