ARM Cortex-A72

ARM Cortex-A72

Broadcom BCM2711, a system on a chip with four ARM Cortex-A72 CPU cores
General information
Launched	2016
Designed by	ARM Holdings
Cache
L1 cache	80  KiB (48 KiB I-cache with parity, 32 KiB D-cache with ECC) per core
L2 cache	512 KiB to 4  MiB
L3 cache	None
Architecture and classification
Technology node	16 nm
Instruction set	ARMv8-A
Physical specifications
Cores	1–4 per cluster, multiple clusters [1]
Products, models, variants
Product code name	Maya
History
Predecessor	ARM Cortex-A57
Successor	ARM Cortex-A73

The ARM Cortex-A72 is a central processing unit implementing the ARMv8-A 64-bit instruction set designed by ARM Holdings' Austin design centre. The Cortex-A72 is a 3-way decode out-of-order superscalar pipeline. ^[1] It is available as SIP core to licensees, 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). The Cortex-A72 was announced in 2015 to serve as the successor of the Cortex-A57, and was designed to use 20% less power or offer 90% greater performance. ^{[2] [3]}

Overview

• Pipelined processor with deeply out-of-order, speculative issue 3-way superscalar execution pipeline
• DSP and NEON SIMD extensions are mandatory per core
• VFPv4 Floating Point Unit onboard (per core)
• Hardware virtualization support
• Thumb-2 instruction set encoding reduces the size of 32-bit programs with little impact on performance.
• TrustZone security extensions
• Program Trace Macrocell and CoreSight Design Kit for unobtrusive tracing of instruction execution
• 32 KiB data (2-way set-associative) + 48 KiB instruction (3-way set-associative) L1 cache per core
• Integrated low-latency level-2 (16-way set-associative) cache controller, 512 KB to 4 MB configurable size per cluster
• 48-entry fully associative L1 instruction translation lookaside buffer (TLB) with native support for 4 KiB, 64 KiB, and 1 MB page sizes
• 32-entry fully associative L1 data TLB with native support for 4 KiB, 64 KiB, and 1 MB page sizes
  • 4-way set-associative of 1024-entry unified L2 TLB per core, supports hit-under-miss
• Sophisticated branch prediction algorithm that significantly increases performance and reduces energy from misprediction and speculation
• Early IC tag –3-way L1 cache at direct-mapped power*
• Regionalized TLB and μBTB tagging
• Small-offset branch-target optimizations
• Suppression of superfluous branch predictor accesses

Chips

• Broadcom BCM2711 system on a chip with four A72 cores. Used in the Raspberry Pi 4. ^[4]
• Qualcomm Snapdragon 650, 652, and 653
• NXP i.MX8, Layerscape LS1026A/LS1046A, LS2044A/LS2084A, LS2048A/LS2088A, LX2160A/LX2120A/LX2080A, LS1028A
• Texas Instruments Jacinto 7 family of automotive and industrial SoC processors.
• Rockchip RK3399, RK3576
• AWS Graviton

See also

• ARM Cortex-A57, predecessor
• ARM Cortex-A73, successor
• Comparison of ARMv8-A cores, ARMv8 family

References

1. "Cortex-A72 Processor". ARM Holdings . Retrieved 2014-02-02.
2. Frumusanu, Andrei (3 February 2015). "ARM Announces Cortex-A72, CCI-500, and Mali-T880". Anandtech. Archived from the original on 4 February 2015. Retrieved 29 March 2017.
3. Frumusanu, Andrei (23 April 2015). "ARM Reveals Cortex-A72 Architecture Details". Anandtech. Archived from the original on 25 April 2015. Retrieved 29 March 2017.
4. "Raspberry Pi 4 on sale now from $35". Raspberry Pi. 2019-06-24. Retrieved 2019-06-24.

External links

• Official website
• ARM Cortex-A72 Technical Reference Manuals