ARM Cortex-X1

The Arm Cortex-X1 is a microarchitecture implementing the ARMv8.2-A 64-bit instruction set designed by ARM Holdings' Austin design centre as part of Arm's Cortex-X Custom (CXC) program.[1][2]

Arm Cortex-X1
General information
Launched2020
Designed byARM Ltd.
Performance
Max. CPU clock rateto 3.0 GHz in phones and 3.3 GHz in tablets/laptops 
Address width40-bit
Cache
L1 cache128 KiB (64 KiB I-cache with parity, 64 KiB D-cache) per core
L2 cache512–1024 KiB per core
L3 cache512 KiB – 8 MiB (optional)
Architecture and classification
ArchitectureARMv8-A
MicroarchitectureArm Cortex-X1
Instruction setA64, A32, and T32 (at the EL0 only)
Extensions
Physical specifications
Cores
  • 1–4 per cluster
Products, models, variants
Product code name(s)
  • Hera
Variant(s)ARM Cortex-A78
History
PredecessorARM Cortex-A77

Design

The Cortex-X1 design is based on the ARM Cortex-A78, but redesigned for purely performance instead of a balance of performance, power, and area (PPA).[1]

The Cortex-X1 is a 5-wide decode out-of-order superscalar design with a 3K macro-OP (MOPs) cache. It can fetch 5 instructions and 8 MOPs per cycle, and rename and dispatch 8 MOPs, and 16 µOPs per cycle. The out-of-order window size has been increased to 224 entries. The backend has 15 execution ports with a pipeline depth of 13 stages and the execution latencies consists of 10 stages. It also features 4x128b SIMD units.[3][4][5][6]

Arm claims the Cortex-X1 offers 30% faster integer and 100% faster machine learning performance than the ARM Cortex-A77.[3][4][5][6]

The Cortex-X1 supports ARM's DynamIQ technology, expected to be used as high-performance cores when used in combination with the ARM Cortex-A78 mid and ARM Cortex-A55 little cores.[1][2]

Licensing

The Cortex-X1 is available as SIP core to partners of their Cortex-X Custom (CXC) program, and its design makes it suitable for integration with other SIP cores (e.g. GPU, display controller, DSP, image processor, etc.) into one die constituting a system on a chip (SoC).[1][2]

Usage
  • Samsung Exynos 2100[7]
  • Qualcomm Snapdragon 888[8]

See also

References
  1. "Introducing the Arm Cortex-X Custom program". community.arm.com. Retrieved 2020-06-18.
  2. Ltd, Arm. "Cortex-X Custom CPU program". Arm | The Architecture for the Digital World. Retrieved 2020-06-18.
  3. Frumusanu, Andrei. "Arm's New Cortex-A78 and Cortex-X1 Microarchitectures: An Efficiency and Performance Divergence". www.anandtech.com. Retrieved 2020-06-18.
  4. "Arm Cortex-X1: The First From The Cortex-X Custom Program". WikiChip Fuse. 2020-05-26. Retrieved 2020-06-18.
  5. McGregor, Jim. "Arm Unleashes CPU Performance With Cortex-X1". Forbes. Retrieved 2020-06-18.
  6. "Arm Cortex-X1 and Cortex-A78 CPUs: Big cores with big differences". Android Authority. 2020-05-26. Retrieved 2020-06-18.
  7. "Exynos 2100 5G Mobile Processor: Specs, Features | Samsung". Samsung Semiconductor. Retrieved 2021-01-13.
  8. "Qualcomm Snapdragon 888 5G Mobile Platform | Latest 5G Snapdragon Processor | Qualcomm". www.qualcomm.com. Retrieved 2021-01-13.


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