Super Street Fighter IV/Universal Abilities/EX Focus Attacks
EX Focus Attacks are the result of canceling a move, be it a Normal Move or a Special Move, into a Focus Attack. Canceling into an EX Focus Attack is the only way you can ever perform one. There's no way to perform a standalone EX Focus Attack. And for all intents and purposes, EX Focus Attacks behave exactly the same as a regular Focus Attack... with two differences.
First off, they cost 2 blocks of your Super Meter to perform. If you do not have enough Super Meter, you cannot cancel any move into an EX Focus Attack.
Secondly, EX Focus Attacks completely lose the ability to absorb an attack for White Damage. The first hit you sustain, no matter what it is, will take you right out of the Focus.
But other than those two differences, EX Focus Attacks behave exactly the same as a regular Focus Attack in every other department.