Arm’s most power efficient mid-range application CPU built on Arm DynamIQ technology. 


The Arm Cortex-A55 processor is a market-leading CPU that delivers the best combination of power efficiency and performance in its class. It is part of the first generation of application CPUs based on DynamIQ technology and features the latest Armv8-A architecture extensions, with dedicated machine learning instructions. 

The Cortex-A55 incorporates an extensively redesigned microarchitecture system that improves performance across the board while being very competitive in area and power efficiency. It delivers up to 18% more performance at 15% better power efficiency when compared to its predecessor, the Cortex-A53. 

Designed to be an extremely scalable CPU, the versatile Cortex-A55 can be used to address a wide range of applications with diverging cost, from the edge to the cloud. The Cortex-A55 can be implemented in both stand-alone applications or as a ‘LITTLE’ CPU to the Cortex-A75 with DynamIQ big.LITTLE.

Learn more about Arm DynamIQ technology

Key benefits

Information on Cortex-A55.

Broad market application

The Cortex-A55 processor is designed for extreme scalability to meet the requirements across multiple markets, while delivering great performance and efficiency for immersive experiences. With over 3000 unique design configurations, the Cortex-A55 CPU can be tailored to your application, be it at the edge, the cloud, or anything in between.

Breakthrough performance

The Cortex-A55 delivers significantly higher performance than the Cortex-A53 across the board, including integer (+18%), floating point (+20%), NEON SIMD (+40%), JavaScript (+15%), and memory (200%) workloads. This boost in performance provides more responsive user interactions for all touchscreen-based devices, higher bandwidth in infrastructure systems, and higher reaction speeds in autonomous automotive.



General Architecture Armv8-A (Harvard)
  Extensions Armv8.1 extensions,
Armv8.2 extensions,
Cryptography extensions,
RAS extensions,
Armv8.3 (LDAPR instructions only)
  ISA Support A64, A32, and T32 instruction sets 
Microarchitecture Pipeline In-order
  Superscalar Yes
  NEON / Floating Point Unit  Optional
  Cryptography Unit
  Max Number of CPUs in Cluster Eight (8)
  Physical Addressing (PA) 40-bit
Memory System and External Interfaces L1 I-Cache / D-Cache 16KB to 64KB
  L2 Cache Optional, 64KB to 256KB
  L3 Cache Optional, 512KB to 4MB
  ECC Support Yes 
  LPAE Yes 
  Bus Interfaces ACE or CHI 
  ACP Optional 
  Peripheral Port Optional 
Other Functional Safety Support ASIL D systematic
  Security TrustZone 
  Interrupts GIC Interface, GICv4 
  Generic Timer  Armv8-A
  PMU PMUv3 
  Debug Armv8-A (plus Armv8.2-A extensions) 
  CoreSight CoreSightv3 
  Embedded Trace Macrocell ETMv4.2 (instruction trace)

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Built as a low-power processor with 64-bit capabilities, the Cortex-A55 processor is applicable in a range of devices requiring high performance in power-constrained environments. Some notable deployments include:


IoT Gateways


Mobile VR



Key features

Superior efficiency

Featuring an extensive microarchitecture redesign, the Cortex-A55 processor is able to achieve breakthrough performance, while maintaining similar levels of power and 15% better power efficiency than the Cortex-A53. The efficiency gain enables the Cortex-A55 to deliver higher sustained performance for thermally constrained applications as well as exceptional power savings for low-power applications. 

New memory subsystem

The Cortex-A55 features an integrated, configurable L2 cache within each CPU that achieves more than 50% reduced latency for memory accesses. It contains an L3 cache that is shared across up to eight Cortex-A55 CPUs within a single cluster. This new memory subsystem, which is designed for high bandwidth, improves overall compute performance while also reducing system power.

State-of-the-art architecture

With support for the Armv8-A architecture, the Cortex-A55 processor is backwards-compatible with existing software and comes with a wealth of existing ecosystem support, from tools to Operating Systems. It also features the latest architecture extensions that introduce new NEON instructions for machine learning, advanced safety features and more support for Reliability, Accessibility and Serviceability (RAS).

DynamIQ big.LITTLE

The Cortex-A55 processor is designed to be compatible with the Cortex-A75 CPU for DynamIQ big.LITTLE, the next generation in big.LITTLE technology. DynamIQ big.LITTLE offers support for new CPU configurations, such as 1xbig + 7xLITTLE and 1xbig + 3xLITTLE, that achieve superior area efficiency, while delivering exceedingly high performance for richer, immersive experiences on all touchscreen-based devices.


Arm training courses and on-site system-design advisory services enable licensees to efficiently integrate the Cortex-A55 processor into their design to realize maximum system performance with lowest risk and fastest time-to-market.

Arm training courses   Arm Design Reviews

  • Manual containing technical information.
  • The Cortex-A55 Technical Reference Manual

    For system designers, system integrators, and programmers who are designing a SoC, the Technical Reference Manual is the go-to resource.

    Read here
  • A guide on software optimization.
  • Cortex-A55 Software Optimization Guide

    For software engineers and programmers, the software optimization guide examines the performance characteristics of instructions in detail.

    Read here
  • A guide on software optimization.
  • Cortex-A Series Programmer’s Guide to Armv8.2-A

    Common to all Cortex-A series processors, this programmer's guide is useful for assembly and C language application development for

    Coming Soon

  • A manual that contains information on safety.
  • Cortex-A55 Safety Documents Package

    For customers who needs to safety certification for their end products, Arm provides a Safety Documentation Package for silicon developers and safety-certified toolchain to accelerate the time to market.

    Coming Soon

  • Product due to be released to  market.
  • Arm Design Reviews

    Arm's on-site design review service gives licensees confidence that their Cortex-A55 CPU is implemented efficiently to provide maximum system performance, with lowest risk and fastest time-to-market.

    Learn more
  • The top half of a human.
  • Questions? Request more information

    Learn more about Cortex-A55, Arm’s most power-efficient, mid-range application CPU, built on Arm DynamIQ technology. Contact us to speak with our technical team.

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