High Altitude N1 Speeds

Hello, Since the N1 is higher during cruise (around 90%) Does that mean the throttles are also 80 to 90 percent?? Its a little confusing to think that the throttles would be around mid range and you can still get 90% N1 , what if you go to full power, would that cause your N1 to rocket past the limit? Is the throttle position in PIC during cruise with 90% N1 simulated correctly? Thank you :)