Editing mediatek/helio/mt6797

{{mediatek title|Helio X20 (MT6797)}}
{{chip
|name=MediaTek Helio X20
|no image=Yes
|designer=MediaTek
|designer 2=ARM Holdings
|manufacturer=TSMC
|model number=Helio X20
|part number=MT6797
|part number 2=MTK6797
|market=Mobile
|market 2=Embedded
|first announced=May 12, 2015
|first launched=March 16, 2016
|family=Helio
|series=Helio X
|frequency=2,100 MHz
|frequency 2=1,850 MHz
|frequency 3=1,400 MHz
|bus type=AMBA 4 AXI
|isa=ARMv8
|isa family=ARM
|microarch=Cortex-A53
|microarch 2=Cortex-A72
|core name=Cortex-A53
|core name 2=Cortex-A72
|process=20 nm
|technology=CMOS
|die area=100 mm²
|word size=64 bit
|core count=10
|thread count=10
|max cpus=1
}}
'''Helio X20''' ('''MT6797''') is a {{arch|64}} [[deca-core]] [[ARM]] [[LTE]] system on a chip designed by [[MediaTek]] and introduced in early [[2016]]. This SoC incorporates 3 independent clusters of cores (called "Tri-Cluster" by MediaTek) operating at varying degrees of performance designed for certain workloads (operating at 1.4 GHz, 1.85 GHz, and 2.1 GHz) and supports up to 6 GiB of dual-channel LPDDR3-1866 memory. This SoC also incorporates a {{armh|Mali-T800 MP4}} [[IGP]] operating at 780 MHz. The chip has a modem supporting [[LTE]] User Equipment (UE) category 6.

The Helio X20 is identical to {{\\|Helio X25}} except for the lower clocked {{armh|Cortex-A72|A72|l=arch}} cores and the lower clocked GPU.
== Architecture ==
The Helio X20 is designed is composed of 3 individual clusters of CPU cores depending on the level of performance required by the active applications.

* Extreme Performance - 2x {{armh|Cortex-A72|l=arch}} @ 2.3 GHz
* Performance/Power Balance - 4x {{armh|Cortex-A53|l=arch}} @ 1.85 GHz
* Power Efficiency - 4x {{armh|Cortex-A53|l=arch}} @ 1.4 GHz

The three clusters are designed as a modified {{armh|big.LITTLE}} configuration.

[[File:mediatek helio x20.png|thumb|right|Architecture slide (note speeds changed since)]]

== Cache ==
{{main|arm holdings/microarchitectures/cortex-a53#Memory_Hierarchy|arm holdings/microarchitectures/cortex-a72#Memory_Hierarchy|l1=Cortex-A53 § Cache|l2=Cortex-A72 § Cache}}
{{empty section}}

== Memory controller ==
{{memory controller
|type=LPDDR3-1600
|ecc=No
|max mem=6 GiB
|controllers=1
|channels=2
|width=32 bit
|max bandwidth=12.8 GB/s (11.92 GiB/s)
|bandwidth schan=6.4 GB/s (5.96 GiB/s)
|bandwidth dchan=12.8 GB/s (11.92 GiB/s)
}}

== Expansions ==
{{expansions
|usb revision=2.0
|usb revision 2=3.0
|usb ports=8
|uart=4
|gp io=Yes
}}

== Graphics ==
{{integrated graphics
| gpu                 = Mali-T880
| device id           = 
| designer            = ARM Holdings
| execution units     = 4
| max displays        = 
| max memory          = 
| frequency           = 780 MHz

| output dsi          = Yes

| max res dsi         = 2560x1600

| direct3d ver        = 11.2
| opencl ver          = 1.2
| opengl ver          = 3.2
| opengl es ver       = 3.2
| vulkan ver          = 1.0
| openvg ver          = 1.1
}}

== Wireless ==
{{wireless links
| wifi              = Yes
| 80211ac           = Yes

| 2g                = Yes
| csd               = Yes
| gsm               = Yes
| gprs              = Yes
| edge              = Yes
| cdmaone           = 
| is-95a            = 
| is-95b            = 
| 3g                = Yes
| cdma2000          = Yes
| cdma2000 1x       = Yes
| cdma2000 1xev-do  = Yes
| cdma2000 1x adv   = 
| umts              = Yes
| wcdma             =  
| td-scdma          = Yes
| dc-hsdpa          = Yes
| hsdpa             = 
| hsupa             = Yes
| 4g                = Yes
| lte a             = Yes
| e-utran           = Yes
| ue cat            = 6
}}

== Image ==
* Integrated image signal processor supports 32 MP
* Supports image stabilization
* Supports video stabilization
* Supports noise reduction
* Supports lens shading correction
* Supports AE/AWB/AF
* Supports edge enhancement
* Supports face detection and visual tracking
* Hardware JPEG encoder

== Video ==
* Video encoding 4K2K @ 30fps with H.265 and HDR
* Video decoding 4K2K @ 30fps, h.264, h.265 / HEVC, MPEG-1/2/4, VC-1, VP-8, VP-9

== Audio ==
* Audio content sampling rates 8kHz to 192kHz
* Audio content sampling format 8-bit/16-bit/24-bit Mono/Stereo
* I2S, PCM
* Encode: AMR-NB, AMR-WB, AAC, OGG, ADPCM
* Decode: WAV, MP3, MP2, AAC, AMR-NB, AMR-WB, MIDI, Vorbis, APE, AAC-plus v1, AAC-plus v2, FLAC, WMA, ADPCM
* 7.1 channel MHL output

== Utilizing devices ==
* [[used by::Alcatel Flash (2017)]]
* [[used by::Doogee F7]]
* [[used by::Doogee F7 Pro]]
* [[used by::Elephone R9]]
* [[used by::Elephone S7]]
* [[used by::HomTom HT10]]
* [[used by::Kodak Ektra]]
* [[used by::LeEco Le 2 Pro X620]]
* [[used by::LeEco Le 2 X620]]
* [[used by::LeEco Le S3 X626]]
* [[used by::Meizu MX6]]
* [[used by::Sharp Z2]]
* [[used by::Vernee Apollo Lite]]
* [[used by::Xiaomi Redmi Note 4]]
* [[used by::Xiaomi Redmi Pro]]
* [[used by::Leagoo T10]]
* [[used by::Lenovo k8 Note]]
* [[used by::Chuwi Hi9 Air]]
* [[used by::CHAOHENG 10]]
* [[used by::Infinix Zero 4 Plus]]
{{expand list}}

== Die ==
* TSMC [[20 nm process]]
* 100 mm² die size
* Quad-core ULP {{armh|Cortex-A53|l=arch}}
** ~21.81 mm² per cluster
*** ~4.23 mm² per core
* Quad-core efficient {{armh|Cortex-A53|l=arch}}
** ~29.73 mm² per cluster
*** ~5.41 mm² per core
* Dual-core High-performance {{armh|Cortex-A72|l=arch}} +  1 MiB L2
** ~27.36 mm² per cluster
*** ~ 9.60 mm² per core
*** ~ 7.50 mm² for 1 MiB L2


:[[File:mt6797 die.png|600px]]

== Bibliography ==
* Mair, Hugh T., et al. "4.3 A 20nm 2.5 GHz ultra-low-power tri-cluster CPU subsystem with adaptive power allocation for optimal mobile SoC performance." Solid-State Circuits Conference (ISSCC), 2016 IEEE International. IEEE, 2016.
base frequency	1,850 MHz (1.85 GHz, 1,850,000 kHz) +, 1,400 MHz (1.4 GHz, 1,400,000 kHz) + and 2,100 MHz (2.1 GHz, 2,100,000 kHz) +
bus type	AMBA 4 AXI +
core count	10 +
core name	Cortex-A53 + and Cortex-A72 +
designer	MediaTek + and ARM Holdings +
die area	100 mm² (0.155 in², 1 cm², 100,000,000 µm²) +
family	Helio +
first announced	May 12, 2015 +
first launched	March 16, 2016 +
full page name	mediatek/helio/mt6797 +
has 2g support	true +
has 3g support	true +
has 4g support	true +
has cdma2000 1x support	true +
has cdma2000 1xev-do support	true +
has cdma2000 support	true +
has csd support	true +
has dc-hsdpa support	true +
has e-utran support	true +
has ecc memory support	false +
has edge support	true +
has gprs support	true +
has gsm support	true +
has hsupa support	true +
has lte advanced support	true +
has td-scdma support	true +
has umts support	true +
instance of	microprocessor +
integrated gpu	Mali-T880 +
integrated gpu base frequency	780 MHz (0.78 GHz, 780,000 KHz) +
integrated gpu designer	ARM Holdings +
integrated gpu execution units	4 +
isa	ARMv8 +
isa family	ARM +
ldate	March 16, 2016 +
manufacturer	TSMC +
market segment	Mobile + and Embedded +
max cpu count	1 +
max memory channels	2 +
microarchitecture	Cortex-A53 + and Cortex-A72 +
model number	Helio X20 +
name	MediaTek Helio X20 +
part number	MT6797 + and MTK6797 +
process	20 nm (0.02 μm, 2.0e-5 mm) +
series	Helio X +
smp max ways	1 +
supported memory type	LPDDR3-1600 +
technology	CMOS +
thread count	10 +
used by	Doogee F7 +, Doogee F7 Pro +, Elephone R9 +, Elephone S7 +, HomTom HT10 +, LeEco Le 2 Pro X620 +, LeEco Le 2 X620 +, Meizu MX6 +, Vernee Apollo Lite +, Xiaomi Redmi Note 4 +, Sharp Z2 +, Alcatel Flash (2017) +, Leagoo T10 +, Xiaomi Redmi Pro +, Kodak Ektra +, Lenovo k8 Note +, Chuwi Hi9 Air +, LeEco Le S3 X626 +, CHAOHENG 10 + and Infinix Zero 4 Plus +
user equipment category	6 +
word size	64 bit (8 octets, 16 nibbles) +