Application Processor

The application processor is the technical term given to a processor of an iDevice. There have been many incarnations of processors for Apple's mobile devices.

Features
Each revision is an ARM SoC tailored to the device's needs. Up through the S5L8922 for the iPod touch 3G, all revisions were altered versions of existing ARM processors. With the S5L8930 (A4), Apple decided to start to design their own chips with a built in AES and a built in GPU allowing for up to (purportedly) 9x faster graphics.

Processor List

 * S5L8900 (iPhone 2G, iPod touch 1G, iPhone 3G)
 * S5L8720 (iPod touch 2G)
 * S5L8920 (iPhone 3GS)
 * S5L8922 (iPod touch 3G)
 * S5L8930 A4 (iPad, iPhone 4, iPod touch 4G, Apple TV 2G)
 * S5L8940 A5 (iPad 2, iPhone 4S)
 * S5L8942 A5 Rev A (Apple TV 3G, iPad 2 Rev A, iPod touch 5G, iPad mini 1G)
 * S5L8945 A5X (iPad 3)
 * S5L8947 A5 Rev B (Apple TV 3G Rev A)
 * S5L8950 A6 (iPhone 5)
 * S5L8955 A6X (iPad 4)