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Apple A9
The Apple A9 is a 64-bit ARM based system-on-chip (SoC) designed by Apple Inc. It first appeared in the iPhone 6S and 6S Plus, which were introduced on September 9, 2015. Apple states that it has 70% more CPU performance and 90% more graphics performance compared to its predecessor, the Apple A8.〔
== Design ==
The A9 features an Apple-designed 64-bit 1.85 GHz〔 ARMv8-A dual-core〔 CPU called Twister.〔http://www.anandtech.com/show/9686/the-apple-iphone-6s-and-iphone-6s-plus-review/4〕 The A9 in the iPhone 6S has 2 GB of LPDDR4 RAM included in the package.〔〔 The A9 has a per-core L1 cache of 64 KB for data and 64 KB for instructions, an L2 cache of 3 MB shared by both CPU cores, and a 4 MB L3 cache that services the entire SoC and acts as a victim cache.
The A9 includes a new image processor, a feature originally introduced in the A5, with better temporal and spatial noise reduction as well as improved local tone mapping. The A9 directly integrates an embedded M9 motion coprocessor, a feature originally introduced with the A7 as a separate chip. In addition to servicing the accelerometer, gyroscope, compass, and barometer, the M9 coprocessor can recognize Siri voice commands.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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