American Football NCAA Rule 3-2-3-a

a. A period shall be extended for an untimed down if one or more of the following occurs during a down in which time expires in the 2nd or 4th quarter (A.R. 3-2-3-I-VIII):
1. A penalty is accepted for a live-ball foul(s) (Exception: Rule 10-2-5- a). At the option of the offended team, the period is not extended if the foul is by the team in possession and the statement of the penalty includes loss of down (A.R. 3-2-3-VIII).