Apple A4

Short description: System on a chip (SoC) designed by Apple Inc.

Apple A4

General Info
Launched| April 3, 2010
Discontinued| September 10, 2013
Designed by| Apple Inc.
Common manufacturer(s)|

* Samsung Electronics

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
Min. feature size| 45 nm
Microarchitecture| ARM Cortex-A8
Instruction set| ARMv7-A
Physical specifications
Cores|

* 1

GPU(s)| PowerVR SGX535[3]
History
Predecessor| Samsung SL58920
Successor| Apple A5

The Apple A4 is a 32-bit package on package (PoP) system on a chip (SoC) designed by Apple Inc. 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]

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 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.

## Contents

* 1 Design
* 2 Products featuring the Apple A4
* 3 Gallery
* 4 See also
* 5 References
* 6 External links

## Design

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", 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.[10] The same Cortex-A8 used in the A4 is also used in Samsung's S5PC110A01 SoC.[11][12] The A4 also features a single-core PowerVR SGX535 graphics processing unit (GPU).[13] The die of the A4 takes up 53.3 mm² of area.[14]

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.[15][16] 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.[17][18][19] The RAM is connected to the A4 using ARM's 64 bits wide AMBA 3 AXI bus.[20]

## Products featuring the Apple A4

* iPad (1st generation)
* iPhone 4
* iPod Touch (4th generation)
* Apple TV (2nd generation)

## Gallery

iPhone 4 Main Logic Board with Apple A4 SoC.

## See also

* Apple silicon, the range of ARM-based SoCs designed by Apple.
* PWRficient, a series of microprocessors designed by P.A. Semi. Apple acquired P.A. Semi to form an in-house custom chip design department.

## References

1. ↑ "iOS 5.1 code hints at simultaneous A5X and A6 processor development". https://arstechnica.com/apple/news/2012/02/ios-51-code-hints-at-simultaneous-a5x-and-a6-processor-development.ars.
2. ↑ 2.0 2.1 Cheng, Jacqui (March 14, 2011). "Ars reviews the iPad 2: big performance gains in a slimmer package / The Apple A5". Ars Technica. https://arstechnica.com/apple/reviews/2011/03/ipad-2-the-ars-review.ars/3.
3. ↑ Klug, Brian; Lal Shimpi, Anand (June 30, 2010). "Apple's iPhone 4: Thoroughly Reviewed". AnandTech. http://www.anandtech.com/show/3794/the-iphone-4-review.
4. ↑ "Updated: Samsung fabs Apple A5 processor". EETimes.com. March 12, 2011. http://www.eetimes.com/electronics-news/4213981/Samsung-fabs-Apple-A5-processor. "The company conducted a cross-section analysis of the chip that revealed details indicating Samsung made the chip in its 45nm process, the same process and fab Apple used for its previous generation A4 SoC."
5. ↑ Clark, Don (2010-04-05). "Apple iPad Taps Familiar Component Suppliers - WSJ.com". Online.wsj.com. https://www.wsj.com/articles/SB10001424052702303912104575164112770784290?mod=rss_Today's_Most_Popular.
6. ↑ 6.0 6.1 "Apple Launches iPad" (Press release). Apple. 2010-01-27. Archived from the original on 30 January 2010. Retrieved 2010-01-28.
7. ↑ "Chipworks Confirms Apple A4 iPad chip is fabbed by Samsung in their 45-nm process". Chipworks. April 15, 2010. http://www.chipworks.com/A4_is_Samsung_45nm.aspx.
8. ↑ Stokes, Jon (2010-04-28). "Apple purchase of Intrinsity confirmed". Ars Technica. https://arstechnica.com/apple/news/2010/04/apple-purchase-of-intrinsity-confirmed.ars.
9. ↑ Merritt, Rick. "Samsung, Intrinsity pump ARM to GHz rate". EETimes.com. http://www.eetimes.com/news/latest/showArticle.jhtml?articleID=218600577.
10. ↑ Keizer, Gregg (2010-04-06). "Apple iPad smokes past the iPhone 3GS in speed". PC World. http://www.pcworld.com/article/193597/Apple_iPad_Smokes_Past_the_iPhone_3GS_in_Speed_Test.html.
11. ↑ Boldt, Paul; Scansen, Don; Whibley, Tim (16 June 2010). "Apple's A4 dissected, discussed...and tantalizing". EETimes.com. http://www.eetimes.com/showArticle.jhtml?articleID=225700447.
12. ↑ "Microsoft PowerPoint - Apple A4 vs SEC S5PC110A01". http://www.ubmtechinsights.com/uploadedFiles/Apple A4 vs SEC S5PC110A01.pdf.
13. ↑ Khullar, Kunal (2017-09-13). "From A4 to the A11 Bionic: The Evolution of Apple 'A' mobile chips" (in en-in). https://in.pcmag.com/apple/116667/from-a4-to-the-a11-bionic-the-evolution-of-apple-a-mobile-chips.
14. ↑ "Chipworks". 2010-09-21. http://chipworks.com/A4_is_Samsung_45nm.aspx. "The die was approximately 7.3 mm square, giving a die area of 53.3 mm²,"
15. ↑ "Teardown of Apple's 4th-gen iPod touch finds 256MB of RAM". Appleinsider.com. 2010-09-08. http://www.appleinsider.com/articles/10/09/08/teardown_of_apples_4th_gen_ipod_touch_finds_256mb_of_ram.html.
16. ↑ "Apple TV 2nd Generation Teardown". iFixit. 2010-09-30. http://www.ifixit.com/Teardown/Apple-TV-2nd-Generation-Teardown/3625/2.
17. ↑ "Apple reveals iPhone 4 has 512MB RAM, doubling iPad - report". Appleinsider.com. 2010-06-17. http://www.appleinsider.com/articles/10/06/17/apple_reveals_iphone_4_has_512mb_ram_doubling_ipad_report.html.
18. ↑ "A Peek Inside Apple's A4 Processor". iFixit. 2010-04-05. http://www.ifixit.com/blog/2010/04/a-peek-inside-apples-a4-processor/.
19. ↑ Greenberg, Marc (2010-04-09). "Apple iPad: no LPDDR2?". Denali. http://www.denali.com/wordpress/index.php/dmr/2010/04/09/apple-ipad-no-lpddr2.
20. ↑ Merritt, Rick (2010-04-09). "iPad equipped to deliver richer graphics". EE Times Asia. http://www.eetasia.com/ART_8800603321_499495_NP_1e1373d9.HTM.

## External links

* MacWorld – Apple inside: the significance of the iPad's A4 chip
* CNET—Inside the iPad: Apple's new 'A4' chip
* HotHardware—iPad's Identity Crisis and Apple's A4 CPU Showstopper
* EETimes—Apple's A4 dissected
* Understanding iPad’s A4 Processor
* ARM Cortex-A series processors
* PowerVR GPU specifications pages

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(64-bit)|

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* NXP i.MX8X
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* Rockchip RK3308

|

Cortex-A53|

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* Samsung Exynos 9 Series 98xx
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Cortex-A73|

* HiSilicon Kirin 960, Kirin 970
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Cortex-A75|

* Qualcomm Snapdragon 71x, Snapdragon 845 and 850
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Cortex-A76|

* HiSilicon Kirin 980, Kirin 990
* Qualcomm Snapdragon 855 and 8cx, Snapdragon 675, Snapdragon 730 and 730G
* MediaTek Helio G90

Cortex-A77|

* MediaTek Dimensity 1000

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compatible|

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* Samsung Mongoose

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