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Cortex-A76 µarch
General Info
Arch Type	CPU
Designer	ARM Holdings
Manufacturer	TSMC
Introduction	May 31, 2018
Process	7 nm
Core Configs	1, 2, 4
Pipeline
OoOE	Yes
Speculative	Yes
Reg Renaming	Yes
Stages	13
Decode	4-way
Instructions
ISA	ARMv8.2
Extensions	FPU, NEON
Cache
L1I Cache	64 KiB/core 4-way set associative
L1D Cache	64 KiB/core 4-way set associative
L2 Cache	256-512 KiB/core 8-way set associative
L3 Cache	0-4 MiB/Cluster
Succession
Cortex-A75 Deimos
Contemporary
Ares

Cortex-A76 (codename Enyo) is the successor to the Cortex-A75, a low-power high-performance ARM microarchitecture designed by ARM Holdings for the mobile market. This microarchitecture is designed as a synthesizable IP core and is sold to other semiconductor companies to be implemented in their own chips. The Cortex-A76, which implemented the ARMv8.2 ISA, is the a performant core which is often combined with a number of lower power cores (e.g. Cortex-A55) in a DynamIQ big.LITTLE configuration to achieve better energy/performance.

Process Technology

Though the Cortex-A76 may be fabricated on various different process nodes, it has been primarily designed for the 12 nm, 7 nm, and 5 nm process nodes.

Architecture

Block Diagram

Typical SoC

Individual Core

Memory Hierarchy

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Overview

The Cortex-A76 is a high-performance synthesizable core designed by Arm as the successor to the Cortex-A75. It is delievered as Register Transfer Level (RTL) description in Verilog and is designed. This core supports the ARMv8.2 extension as well as a number of other partial extensions. The A76 is a 4-way superscalar out-of-order processor with a private level 1 and level 2 caches. It is designed to be implemented inside the DynamIQ Shared Unit (DSU) cluster along with other cores (e.g., with little cores such as the Cortex-A55)

Core

The Cortex-A76 succeeds the Cortex-A75. It is designed to take advantage of the 7 nm node in order to deliver up to 35% higher performance and up to 40% lower power (compared ot the A75 on the 10 nm node). It's worth noting that the A76 brings higher performance at a slight hit to area by going wider.

Overview

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Pipeline

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Bibliography

• Arm Tech Day, 2018