Loading AI tools
System on a chip (SoC) designed by Apple Inc. From Wikipedia, the free encyclopedia
The Apple A4 is a 32-bit package on package (PoP) system on a chip (SoC) designed by Apple Inc., part of the Apple silicon series, and manufactured by Samsung.[4][5] It was the first SoC Apple designed in-house. The first product to feature the A4 was the first-generation iPad, followed by the iPhone 4, fourth-generation iPod Touch, and second-generation Apple TV.[6]
| |
| General information | |
|---|---|
| Launched | April 3, 2010 |
| Discontinued | September 10, 2013 |
| Designed by | Apple Inc. |
| Common manufacturer | |
| Product code | S5L8930X[1] |
| Performance | |
| Max. CPU clock rate | 800 MHz to 1 GHz |
| Cache | |
| L1 cache | 32 KB instruction + 32 KB data[2] |
| L2 cache | 512 KB[2] |
| Architecture and classification | |
| Application | Mobile |
| Technology node | 45 nm |
| Microarchitecture | ARM Cortex-A8 |
| Instruction set | ARMv7-A |
| Physical specifications | |
| Cores |
|
| GPU | PowerVR SGX535[3] |
| History | |
| Predecessor | Samsung S5L8920 |
| Successors | Apple A5 (iPhone) Apple A5X (iPad) |
The last operating system update Apple provided for a mobile device containing an A4 (iPhone 4) was iOS 7.1.2, which was released on June 30, 2014 as it was discontinued with the release of iOS 8 in September 2014.
The iPad (1st generation) was discontinued earlier than the iPhone 4 with the release of iOS 5.1.1 on May 7, 2012 because it only had 256 MB of RAM compared to 512 MB on the iPhone, and the fact that applications would crash more frequently with the graphics using a large portion of the RAM.
The last operating system update Apple provided for an Apple TV containing an A4 (second-generation Apple TV) was Apple TV Software 6.2.1, which was released on September 17, 2014.
Apple engineers designed the A4 chip with an emphasis on being "extremely powerful yet extremely power efficient."[6] The A4 features a single-core ARM Cortex-A8 central processing unit (CPU) manufactured on Samsung's 45 nm fabrication process[7] using performance enhancements developed by chip designer Intrinsity (which was subsequently acquired by Apple)[8] in collaboration with Samsung.[9] The resulting CPU, dubbed "Hummingbird",[10] is able to run at a far higher clock rate than previous Cortex-A8 CPUs while remaining fully compatible with the Cortex-A8 design provided by ARM.[11] The same Cortex-A8 used in the A4 is also used in Samsung's S5PC110A01 SoC.[12][13] The A4 also features a single-core PowerVR SGX535 graphics processing unit (GPU).[14] The die of the A4 takes up 53.3 mm2 of area.[15]
The clock rate of the Cortex-A8 in the A4 used inside the first-generation iPad is 1 GHz. The clock rate of the Cortex-A8 in the A4 used inside the iPhone 4 and fourth-generation iPod Touch is 800 MHz (underclocked from 1 GHz). It is unknown what the clock rate of the Cortex-A8 in the A4 used inside the second-generation Apple TV is.
The A4 uses the PoP method of installation to support RAM. The top package of the A4 used inside the first-generation iPad, the fourth-generation iPod Touch, and the second-generation Apple TV contains two 128 MB LPDDR chips, providing a total of 256 MB of RAM.[16][17] The top package of the A4 used inside the iPhone 4 contains two 256 MB LPDDR chips, providing a total of 512 MB of RAM.[18][19][20] The RAM is connected to the A4 using ARM's 64 bits wide AMBA 3 AXI bus.[21]
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.
