Here are the actual NFL Rules

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Article 3 Completed or Intercepted Pass.
A player who makes a catch may advance the ball. A forward pass is complete (by the offense) or intercepted (by the defense) if a player, who is inbounds: (a) secures control of the ball in his hands or arms prior to the ball touching the ground; and (b) touches the ground inbounds with both feet or with any part of his body other than his hands; and (c) maintains control of the ball long enough, after (a) and (b) have been fulfilled, to enable him to perform any act common to the game (i.e., maintaining control long enough to pitch it, pass it, advance with it, or avoid or ward off an opponent, etc.).

Item 1: Player Going to the Ground.
If a player goes to the ground in the act of catching a pass (with or without contact by an opponent), he must maintain control of the ball throughout the process of contactingthe ground, whether in the field of play or the end zone. If he loses control of the ball, and the ball touches the ground before he regains control, the pass is incomplete. If he regains control prior to the ball touchingthe ground, the pass is complete.

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