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{{NotChineseTitle|time=2016-11-09T11:47:12+00:00}}
{{noteTA|G1=IT|1=zh-hant:積體電路製造;zh-hans:积体电路制造}}
{{Infobox CPU
| name = Apple A8
| image = Apple A8 system-on-a-chip.jpg
| image_size = 144px
| caption =
| produced-start = 2014年9月9日
| produced-end =
| slowest = 1.4 | slow-unit = GHz<ref name="Geekbench">{{Cite web |url=http://www.macrumors.com/2014/09/09/iphone-6-geekbench-1-4-ghz-dual-core-a8-1gb-ram/ |title=Alleged iPhone 6 Geekbench Results Reveal 1.4 GHz Dual-Core A8 Chip, 1 GB of RAM |accessdate=2014-09-20 |archive-date=2014-09-11 |archive-url=https://web.archive.org/web/20140911002142/http://www.macrumors.com/2014/09/09/iphone-6-geekbench-1-4-ghz-dual-core-a8-1gb-ram/ |dead-url=no }}</ref>
| fastest = | fast-unit =
| size-from = 20 nm<ref name="AnandTech-Apple-Announces-A8" />
| size-to =
| soldby =
| designfirm = [[Apple Inc.]]
| manuf1 = [[TSMC]]
| arch = ARMv8
| microarch = Cyclone
| code = APL1011<ref name="iiPhone6PlusTeardown">{{cite web |url=https://www.ifixit.com/Teardown/iPhone+6+Plus+Teardown/29206 |title=iPhone 6 Plus Teardown |publisher=iFixit |date=2014-09-18 |accessdate=2014-09-19 |archive-date=2018-07-17 |archive-url=https://web.archive.org/web/20180717233222/https://www.ifixit.com/Teardown/iPhone+6+Plus+Teardown/29206 |dead-url=no }}</ref>
| numcores = 2<ref name="extremetech">{{cite web|last1=Anthony|first1=Sebastian|title=Apple’s A8 SoC analyzed: The iPhone 6 chip is a 2-billion-transistor 20nm monster|url=http://www.extremetech.com/computing/189787-apples-a8-soc-analyzed-the-iphone-6-chip-is-a-2-billion-transistor-20nm-monster|website=www.extremetech.com|publisher=ExtremeTech|accessdate=2014-09-10|archive-date=2014-09-11|archive-url=https://web.archive.org/web/20140911013845/http://www.extremetech.com/computing/189787-apples-a8-soc-analyzed-the-iphone-6-chip-is-a-2-billion-transistor-20nm-monster|dead-url=no}}</ref>
| l1cache = 64 kB 指令 + 64 kB 數據
| l2cache = 1MB
| l3cache = 4MB
| gpu = PowerVR Series 6 GX6650 (six cluster) - unconfirmed<ref name="extremetech" />
| application = [[移动设备]]
| predecessor = [[Apple A7]]
| successor = [[Apple A9]]
| variant = [[Apple A8X]]
}}
'''Apple A8'''是[[蘋果公司]]設計的第二代[[64位元]][[系統單晶片]]（SoC）。在2014年9月9日發佈，用於[[iPhone 6]]、[[iPhone 6 Plus]]、[[iPad mini 4]]、[[iPod touch 6]]、[[Apple TV]]和[[HomePod]]。<ref name="Apple iPhone 6 PR">{{cite press release |url=http://www.apple.com/pr/library/2014/09/09Apple-Announces-iPhone-6-iPhone-6-Plus-The-Biggest-Advancements-in-iPhone-History.html |title=Apple Announces iPhone 6 & iPhone 6 Plus—The Biggest Advancements in iPhone History |publisher=Apple |date=2014-09-09 |accessdate=2014-09-09 |archive-date=2014-09-09 |archive-url=https://web.archive.org/web/20140909213704/http://www.apple.com/pr/library/2014/09/09Apple-Announces-iPhone-6-iPhone-6-Plus-The-Biggest-Advancements-in-iPhone-History.html |dead-url=no }}</ref>
蘋果公司宣稱它比上代[[Apple A7]]在[[CPU]]效能高25%，繪圖效能高50%，能源效益高50%。<ref name="Verge A8">{{cite news |last=Savov |first=Vlad |title=iPhone 6 and iPhone 6 Plus have a new faster A8 processor |url=http://www.theverge.com/2014/9/9/6127111/iphone-6-and-iphone-6-plus-have-a-new-faster-a8-processor |work=The Verge |publisher=Vox Media |date=2014-09-09 |accessdate=2014-09-09 |archive-date=2014-09-10 |archive-url=https://web.archive.org/web/20140910225625/http://www.theverge.com/2014/9/9/6127111/iphone-6-and-iphone-6-plus-have-a-new-faster-a8-processor |dead-url=no }}</ref>

== 技術 ==
CPU部份為自家定制的「改良版Cyclone」，上代A7則是「Cyclone」，維持雙核心設計，L1[[CPU快取|快取]]為64KB指令+64KB數據，L2為1MB，L3則為4MB。GPU則採用[[Imagination Technologies]]的[[PowerVR]] GX6450，核心數目依然為4個，依蘋果公司的宣稱，比上代繪圖效能高50%。<ref name="anandtech analyzing">{{cite news|author=Ryan Smith|title=Analyzing Apple’s A8 SoC: PowerVR GX6650 & More|url=http://www.anandtech.com/show/8514/analyzing-apples-a8-soc-gx6650-more|accessdate=2014-09-21|newspaper=Anandtech|date=September 10, 2014|archive-date=2014-09-21|archive-url=https://web.archive.org/web/20140921054419/http://www.anandtech.com/show/8514/analyzing-apples-a8-soc-gx6650-more|dead-url=no}}</ref>值得一提的是蘋果公司也持有Imagination Technologies公司9.5%股權。

Apple A8採用[[台灣積體電路製造公司]]20nm製程生產<ref name="AnandTech-Apple-Announces-A8">{{cite web |last=Smith |first=Ryan |url=http://www.anandtech.com/show/8504/apple-announces-a8-soc |title=Apple Announces A8 SoC |publisher=AnandTech |date=2014-09-09 |accessdate=2014-09-09 |archive-date=2014-09-10 |archive-url=https://web.archive.org/web/20140910200128/http://www.anandtech.com/show/8504/apple-announces-a8-soc |dead-url=no }}</ref><ref name="Chipworks-iPhone6">{{cite web|url=http://www.chipworks.com/en/technical-competitive-analysis/resources/blog/inside-the-iphone-6-and-iphone-6-plus/|title=Inside the iPhone 6 and iPhone 6 Plus|publisher=Chipworks|date=2014-09-19|accessdate=2014-09-20|archiveurl=https://web.archive.org/web/20140924015413/http://www.chipworks.com/en/technical-competitive-analysis/resources/blog/inside-the-iphone-6-and-iphone-6-plus/|archivedate=2014-09-24|dead-url=yes}}</ref>，不再由[[三星電子|三星]]代工。

它包含20億個[[電晶體]]，大約是Apple A7的兩倍，晶粒大小卻減少13%，由102mm2減至89mm2（沒有採用新架構，只是電晶體排得密）。<ref name="extremetech" />1GB LP[[DDR3]]記憶體亦一同封裝在SoC。<ref name="iiPhone6PlusTeardown" />iPhone 6採用的LPDDR3記憶體是由[[Hynix|SK Hynix]]生產，iPhone 6 Plus的記憶體則由[[Elpida]]生產。<ref>{{cite news|title=逐漸擺脫 Samsung，Apple A8 SoC 處理器由台灣 TSMC 代工|url=http://chinese.vr-zone.com/128303/apple-a8-soc-cpu-made-by-taiwan-tsmc-confirm-by-chipworks-09212014/|accessdate=2014-09-21|newspaper=vr-zone|date=2014-09-21|archive-date=2014-09-21|archive-url=https://web.archive.org/web/20140921195643/http://chinese.vr-zone.com/128303/apple-a8-soc-cpu-made-by-taiwan-tsmc-confirm-by-chipworks-09212014/|dead-url=no}}</ref>

Geekbench[[基準測試]]顯示處理器為雙核心，頻率1.38GHz，符合蘋果公司的宣稱（比上代快25%）。<ref name="Geekbench"/>

下表列出了蘋果公司近幾代SoC的效能和規格：<ref name="anandtech analyzing" />
{| class="wikitable"
|-
! Apple SoC !! CPU效能 !! GPU效能 !! 晶粒大小 !! 電晶體 !! 製程
|-
| A5 || ~13x || ~20x || 122mm2 || <10億 || 45nm
|-
| A6 || ~26x || ~34x || 97mm2 || <10億 || 32nm
|-
| A7 || 40x || 56x || 102mm2 || >10億 || 28nm
|-
| A8 || 50x || 86x || 89mm2 || ~20億 || 20nm
|-
| A9 || || || || ||16nm
14nm
|-
| A9X || || || || ||
|}

== 比較 ==
{| class="wikitable"
|-
! 標題文字 !! A4 !! A5 A5X !! A6 A6X !! A7 !! A8 A8X !! A9 A9X
|-
! 產品化 || || || 2012年9月 || 2013年9月至今 || A8: 2014年9月 A8X: 2014年10月 || A9: 2015年9月 A9X: 2015年9月
|-
! 最低频率 || || || 550MHz || ||
|-
! 满载频率 || 1Ghz || 1Ghz || 1.3Ghz || A7: 1.3Ghz A7: 1.4Ghz || A8: 1.4 GHz A8X: 1.5Ghz ||
|-
! 设计公司 || colspan="6"| [[Apple Inc.]]
|-
! 製造商 || colspan="4" | [[三星電子]] || [[TSMC]] || A9: 三星電子 , TSMC A9X: TSMC
|-
| 指令集架構 || Cortex-A8（32位元）|| Cortex-A9（32位元）|| ARMv7-A（32位元） Swift || ARMv8-A（64位元） Cyclone || ARMv8-A（64位元） Typhoon || ARMv8-A（64位元） Twister
|-
| 制作工艺/製程 || 45nm || 45nm，32nm，28nm || 32nm || 28nm || 20nm || A9: 14nm_(三星電子), 16nm_(TSMC) A9X: 16nm_(TSMC)
|-
| 產品編碼 || || S5L8940X(45nm) S5L8942X(32nm) S5L8947X(单核心,32nm) S5L8945X || S5L8950X || S5L8960X || APL1011 ||
|-
! 核心数量 || 1 || colspan="3" | 2 || A8: 2 A8X: 3 ||
|-
| 图形处理器 || PowerVR SGX 535 || A5:PowerVR SGX543 MP2 A5X:PowerVR SGX543 MP4 || A6:PowerVR SGX543 MP3 A6X:PowerVR SGX554 MP4 ||PowerVR G6430 || A8:PowerVR GX6450 A8X:PowerVR GXA6850 ||
|-
! 一級缓存 || colspan="3" | 32kB指令+32kB資料 || colspan="3" | 64kB指令+64kB數據
|-
! 二級缓存 || 640 kB || colspan="3" | 1MB || A8: 1MB A8X: 2MB ||
|-
! 三級缓存 || colspan="3" | N/A || colspan="2" | 4MB ||
|-
| 應用范围 || 800_MHz(用于iPhone, iPod) 1_GHz(用于iPad) || A5:iPhone_4S 和iPad_2 和iPad_mini 和iPod_Touch(第五代) A5X:The New iPad || A6:iPhone_5 A6X:iPad with Retina display || 1.3GHz(iPhone_5s和iPad_mini_2/3) 1.4GHz(iPad_Air) || A8:iPhone_6 和iPhone_6_Plus 和iPod Touch(第六代) 和Apple TV(第四代) 和iPad_mini_4 A8X:iPad_Air_2 || A9: iPhone_6s 和iPhone_6s_Plus A9X: iPad_Pro
|}

== 產品使用 ==
* [[iPhone 6]]
* [[iPhone 6 Plus]]
* [[iPad mini 4]]
* [[iPod touch|iPod touch 6]]
* 第四代[[Apple TV]]
* [[HomePod|HomePod]]

==參見==
* [[Apple Silicon]]
* [[Apple A7]]
* [[Apple A9]]

==參考文獻==
{{Reflist|30em}}

{{苹果公司硬件}}
{{ARM芯片}}
[[Category:64位元微處理器]]
[[Category:Apple晶片]]
[[Category:ARM架構]]
[[Category:2019年終止的產品與服務]]
[[Category:2022年終止的產品與服務]]

Apple A8 - 版本历史

imported>Kdmjf12000 来自 2026年3月8日 (日) 08:49