Editing Kirin 990 4G

{{hisil title|Kirin 990 4G}}
{{chip
|future=Yes
|name=Kirin 990 4G
|no image=Yes
|designer=HiSilicon
|designer 2=ARM Holdings
|manufacturer=TSMC
|model number=990 4G
|market=Mobile
|first announced=September 6, 2019
|first launched=September 6, 2019
|family=Kirin
|frequency=2,860 MHz
|frequency 2=2,090 MHz
|frequency 3=1,860 MHz
|isa=ARMv8
|isa family=ARM
|microarch=Cortex-A76
|microarch 2=Cortex-A55
|core name=Cortex-A76
|core name 2=Cortex-A55
|process=7 nm
|transistors=8,000,000,000
|technology=CMOS
|die size=90.00mm²
|word size=64 bit
|core count=8
|thread count=8
}}
'''Kirin 990 4G''' is a {{arch|64}} high-performance mobile [[ARM]] [[LTE]] SoC designed by [[HiSilicon]] and introduced in late 2019. Fabricated on TSMC's [[7 nm process]], the 990 4G incorporates two [[big cores|high frequency]] {{armh|Cortex-A76|l=arch}} cores operating at 2.86 GHz along with two [[big cores|medium frequency]] {{armh|Cortex-A76|l=arch}} cores operating at 2.09 GHz along with four {{armh|Cortex-A55|l=arch}} cores operating at up to 1.86 GHz.

This SoC has an integrated LTE modem [[Balong 765]] supporting 1.6 Gbps download (Cat21), incorporates an ARM {{armh|Mali-G76}}, and supports LPDDR4X-4266 memory.

== Overview ==
Introduced at the 2019 IFA, the Kirin 990 4G uses the same ARM cortex ([[cortex-a76|Cortex A76]] + [[cortex-a55|Cortex A55]]) versions as its predecessor, the Kirin 980, but the clock frequencies have been increased:
The Kirin 990 4G features two high-performance [[big cores|big]] {{armh|Cortex-A76|l=arch}} core operating at 2.86 GHz, 2 medium-performance [[big cores|big]] {{armh|Cortex-A76|l=arch}} operating at 2.09 GHz, and four [[little cores|little]] {{armh|Cortex-A55|l=arch}} cores operating at 1.86 GHz.
The Kirin 990 4G has approximately 8.0 billion transistors, compared to 6.9 billiongs transistors of his precedessor, the Kirin 980, that has been produced in the same 7nm process node at TSMC in Taiwan. The Kirin 990 4G incorporates an in-house developed NPU dual-[[neural processor]] "DaVinci" designed for [[AI]] acceleration.

== Cache ==
{{main|arm holdings/microarchitectures/cortex-a55#Memory_Hierarchy|arm holdings/microarchitectures/cortex-a76#Memory_Hierarchy|l1=Cortex-A55 § Cache|l2=Cortex-A76 § Cache}}

For the {{armh|Cortex-A76|l=arch}}:

{{cache size
|l1 cache=512 KiB
|l1i cache=256 KiB
|l1i break=4x64 KiB
|l1d cache=256 KiB
|l1d break=4x64 KiB
|l2 cache=2 MiB
|l2 break=4x512 KiB
}}

For the {{armh|Cortex-A55|l=arch}}:

{{cache size
|l1 cache=256 KiB
|l1i cache=128 KiB
|l1i break=4x32 KiB
|l1d cache=128 KiB
|l1d break=4x32 KiB
|l2 cache=512 KiB
|l2 break=4x128 KiB
}}


== Memory controller ==
The Kirin 990 4G supports 4-channel LPDDR4X up to 4266 MHz. Each channel supports at most two ranks.

{{memory controller
|type=LPDDR4X-4266
|ecc=No
|max mem=8 GiB
|controllers=1
|channels=4
|width=16 bit
|max bandwidth=31.78 GiB/s
|bandwidth dchan=15.89 GiB/s
|bandwidth qchan=31.78 GiB/s
}}

== Graphics ==
{{integrated graphics
| gpu                 = Mali-G76
| designer            = ARM Holdings
| execution units     = 16
| max displays        = 2
| max memory          = 
| frequency           = 750 MHz
| max frequency       = 

| output crt          = 
| output sdvo         = 
| output dsi          = Yes
| output edp          = 
| output dp           = 
| output hdmi         = 
| output vga          = 
| output dvi          = 

| directx ver        = 12
| opengl es ver      = 3.2
| openvg ver         = 1.1
| opencl ver         = 1.2
| vulkan ver         = 1.0
}}

== Wireless ==
* LTE Modem
** DL: Up to [[User Equipment]] (UE) category 21
*** Downlink of up to 1.6 Gbps (4x4 MIMO + 256QAM 3CC CA = 1.6 Gbps, 2x2 MIMO + 256QAM + 1CC = 200 Mbps)
** UL: Up to [[User Equipment]] (UE) category 19
*** Uplink of up to 200 Mbps (2x2 MIMO, 256-QAM, 1x20MHz CA)
* Wi-Fi 802.11 ac
* Bluetooth 5
* NFC
* GPS / A-GPS / GLONASS / BDS

== Utilizing devices ==


== Bibliography ==
* Huawei Kirin 990 Keynote, 2019 IFA
base frequency	2,860 MHz (2.86 GHz, 2,860,000 kHz) +, 1,860 MHz (1.86 GHz, 1,860,000 kHz) + and 2,088 MHz (2.088 GHz, 2,088,000 kHz) +
core count	8 +
core name	Cortex-A76 + and Cortex-A55 +
designer	HiSilicon + and ARM Holdings +
die area	90 mm² (0.14 in², 0.9 cm², 90,000,000 µm²) +
family	Kirin +
first announced	September 6, 2019 +
first launched	September 6, 2019 +
full page name	Kirin 990 4G +
has ecc memory support	false +
instance of	microprocessor +
integrated gpu	Mali-G76 +
integrated gpu base frequency	600 MHz (0.6 GHz, 600,000 KHz) +
integrated gpu designer	ARM Holdings +
integrated gpu execution units	16 +
isa	ARMv8 +
isa family	ARM +
l1$ size	512 KiB (524,288 B, 0.5 MiB) + and 256 KiB (262,144 B, 0.25 MiB) +
l1d$ size	256 KiB (262,144 B, 0.25 MiB) + and 128 KiB (131,072 B, 0.125 MiB) +
l1i$ size	256 KiB (262,144 B, 0.25 MiB) + and 128 KiB (131,072 B, 0.125 MiB) +
l2$ size	2 MiB (2,048 KiB, 2,097,152 B, 0.00195 GiB) + and 0.5 MiB (512 KiB, 524,288 B, 4.882812e-4 GiB) +
ldate	3000 +
manufacturer	TSMC +
market segment	Mobile +
max memory bandwidth	31.78 GiB/s (32,542.72 MiB/s, 34.124 GB/s, 34,123.515 MB/s, 0.031 TiB/s, 0.0341 TB/s) +
max memory channels	4 +
microarchitecture	Cortex-A76 + and Cortex-A55 +
model number	990 4G +
name	Kirin 990 4G +
process	7 nm (0.007 μm, 7.0e-6 mm) +
series	900 +
supported memory type	LPDDR4X-4266 +
technology	CMOS +
thread count	8 +
transistor count	8,000,000,000 +
used by	Huawei Mate 30 +, Huawei Mate 30 Pro +, Huawei P40 4G +, Huawei Nova 6 +, Huawei Nova 6 5G +, Honor V30 +, Honor Play4 Pro + and Huawei MatePad Pro (WiFi/4G) (2019-2020 +
word size	64 bit (8 octets, 16 nibbles) +