Specifications

This Automotive Enhanced (AE) processor is based on the second generation DynamIQ CPU, Cortex-A76 and comes with Split-Lock capability which includes Dual Core Lock-Step (DCLS), an advanced feature for increased fault tolerance designs.

The Cortex-A76AE is the first of an all new Arm Cortex-A family of Automotive Enhanced (AE), high performance processors. It is designed for devices undertaking complex and demanding safety critical tasks. The Cortex-A76AE is based on the second generation DynamIQ CPU, Cortex-A76 and comes with Dual Core Lock-Step (DCLS), an advanced feature for increased fault tolerance designs.

The Cortex-A76AE is part of the Arm Safety Ready program, a collection of products across the Arm portfolio that have been through various and rigorous levels of functional safety systematic flows and development.

Cotex-A76AE Block Diagram
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 (at the EL0 only)
 
Microarchitecture Pipeline Out-of-order
  Superscalar Yes
  Neon / Floating Point Unit Included
  Cryptography Unit Optional
  Max number of CPUs in cluster Four (4)
  Physical Addressing (PA) 40-bit
Memory system and external interfaces L1 I-Cache / D-Cache 64KB
  L2 Cache 128KB to 512KB
  L3 Cache Optional, 512KB to 4MB
  ECC Support Yes
  LPAE Yes
  Bus interfaces AMBA ACE or CHI
  ACP Optional
  Peripheral Port Optional
Functional Safety Dual Core Lock-Step (DCLS) Yes (in safety-mode)
  Memory protection Yes
  Interface protection Yes
  Safety capability
  • Contributes towards up to ASIL D hardware diagnostic metrics.
  • Suitable for up to ASIL D systematic development

Safety package Yes (Extended package)
Other Functional Safety Support Supports ASIL D diagnostics
  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)

Key benefits

  • Split-Lock capability which offers the flexibility to operate in two modes; split mode for performance and lock mode for safety.
  • Fault-tolerant operation in lock mode with DCLS.
  • 4x performance for inference machine learning at the edge.

Key features compared to Cortex-A75

  • 40% better power efficiency per core.
  • 35% improved performance per core. 

Cortex-A comparison table (Armv7-A)
Feature Cortex-A5 Cortex-A7 Cortex-A9 Cortex-A15 Cortex-A17
Instruction set architecture and extensions Armv7-A Armv7-A
LPAE Virtualization
Armv7-A Armv7-A
LPAE Virtualization
Armv7-A
LPAE Virtualization
Pipeline In order In order Out of order Out of order Out of order
Superscalar No Partial Yes Yes Yes
Neon and Floating Point Unit Optional Optional Optional Optional Included
Floating Point Unit only Optional Optional Optional Optional Included
Cryptography Unit No No No No No
Physical Addressing (PA) 32-bit 40-bit 32-bit 40-bit 40-bit
Dual Core Lock-Step (DCLS) No No No No No
L1 I-Cache / D-Cache 4k-64KB 8k-64KB 16k-64KB 32KB/32KB 32k-64KB/32KB
L2 Cache External L2C-310 Up to 1MB External L2C-310 512KB-4MB 256KB-8MB
L3 Cache NA NA NA NA NA
ECC / Parity   No Yes Yes L2 only
LPAE No Yes No Yes Yes
Bus Interfaces AXI ACE AXI ACE or CHI ACE
ACP Optional No Optional Optional Optional
Peripheral Port     No No Yes
Functional Safety Support          
Security TrustZone TrustZone TrustZone TrustZone TrustZone
Interrupt Controller Optional Integrated GIC v1 (MP only) Optional Integrated GIC v2 Internal Integrated GIC v1 (MP only) Optional Integrated GICv2 External GICv2
Generic Timer No Yes Yes Armv8-A Armv8-A

Cortex-A comparison (Armv8-A)

Feature Cortex-A32 Cortex-A34 Cortex-A35 Cortex-A53 Cortex-A55 Cortex-A57 Cortex-A65 Cortex-A65AE Cortex-A72 Cortex-A73 Cortex-A75 Cortex-A76 Cortex-A76AE Cortex-A77 Cortex-A78
Instruction set architecture and extensions Armv8-A AArch32 only Armv8-A AArch64 only Armv8-A Armv8-A Armv8-A, Armv8.1 extensions, Armv8.2 extensions, Cryptography extensions, RAS extensions, Armv8.3 (LDAPR instructions only), Armv8.4 Dot Product Armv8-A Armv8-A
AArch64
only

Armv8-A, Armv8.1 extensions, Armv8.2 extensions, Cryptography extensions, RAS extensions, Armv8.3 (LDAPR instructions only)
Armv8-A, Armv8.1 extensions, Armv8.2 extensions, Cryptography extensions, RAS extensions, Armv8.3 (LDAPR instructions only), Armv8.4 Dot Product Armv8-A Armv8-A Armv8-A, Armv8.1 extensions, Armv8.2 extensions, Cryptography extensions, RAS extensions, Armv8.3 (LDAPR instructions only), Armv8.4 Dot Product Armv8-A
AArch64,
AArch32 at EL0

Armv8-A, Armv8.1 extensions, Armv8.2 extensions, Cryptography extensions, RAS extensions, Armv8.3 (LDAPR instructions only), Armv8.4 Dot Product
Armv8-A
AArch64,
AArch32 at EL0

Armv8-A, Armv8.1 extensions, Armv8.2 extensions, Cryptography extensions, RAS extensions, Armv8.3 (LDAPR instructions only), Armv8.4 Dot Product
Armv8-A
AArch64
AArch32 at EL0

Armv8-A, Armv8.1 extensions, Armv8.2 extensions, Cryptography extensions, RAS extensions, Armv8.3 (LDAPR instructions only), Armv8.4 Dot Product
Armv8-A, Armv8.1 extensions, Armv8.2 extensions, Cryptography extensions, RAS extensions, Armv8.3 (LDAPR instructions only), Armv8.4 Dot Product
Pipeline In order In order In order In order In order Out of order Out of order Out-of-order Out of order Out of order Out-of-order Out-of-order Out-of-order Out-of-order
Out-of-order
Superscalar       Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Yes
Neon and Floating Point Unit Optional Optional Optional Optional Optional Included Included Included Included Included Included Included Included Included
Included
Floating Point Unit only N/A N/A N/A N/A Optional Included Included Included Included Included Included Included Included Included
Included
Cryptography Unit Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional
Optional
Physical Addressing (PA) 40-bit 40-bit 40-bit 40-bit 40-bit 40-bit 44-bit 44-bit 44-bit 40-bit 44-bit 40-bit 40-bit 40-bit
40-bit
Dual Core Lock-Step (DCLS) No No No No No No No Yes (in safety-mode) No No No No Yes (in safety-mode) No
No
L1 I-Cache / D-Cache 8KB-64KB 8KB-64KB 8K-64KB 8KB-64KB 16KB-64KB 48KB/32KB 16KB to 64KB 16KB to 64KB 48KB/32KB-64KB 32KB/32KB-64KB 64KB 64KB 64KB 64KB
64KB
L2 Cache 128KB-1MB 128KB-1MB 128KB-1MB 128KB-2MB 64KB-256KB 512KB-2MB 64KB to 256KB 64KB to 256KB 512KB-4MB 256KB-8MB 256KB to 512KB 256KB to 512KB 256KB to 512KB 256KB to 512KB
256KB to 512KB
L3 Cache NA NA NA NA Optional
From 256KB to 4MB
NA Optional 512KB to 4MB Optional 512KB to 4MB NA NA Optional 512KB to 4MB Optional 512KB to 4MB Optional 512KB to 4MB Optional 512KB to 4MB
Optional 512KB to 4MB
ECC / Parity Yes Yes Yes Yes Yes Yes Yes Yes Yes L2 only Yes Yes Yes Yes
Yes
LPAE Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Yes
Bus Interfaces ACE or CHI ACE or CHI ACE or CHI ACE or CHI ACE or CHI ACE or CHI ACE or CHI ACE or CHI ACE or CHI ACE ACE or CHI ACE or CHI ACE or CHI ACE or CHI
ACE or CHI
ACP Optional Optional Optional Optional Optional Yes Optional Optional Optional Yes Optional Optional Optional Optional
Optional
Peripheral Port         Optional   Optional Optional     Optional Optional Optional Optional
Optional
Functional Safety Support Yes Yes Yes Yes Yes Yes   Yes Yes   Yes Yes Yes Yes
ASIL D systematic
Security TrustZone TrustZone TrustZone TrustZone TrustZone TrustZone TrustZone TrustZone TrustZone TrustZone TrustZone TrustZone TrustZone TrustZone
TrustZone
Interrupt Controller External
GICv3
External
GICv3
External
GICv3
External
GICv3
External
GICv4
External
GICv3
External
GICv4
External
GICv4
External
GICv3
External
GICv3
External
GICv4
External
GICv4
External
GICv4
External
GICv4
External
GICv4
Generic Timer Armv8-A Armv8-A Armv8-A Armv8-A Armv8-A Armv8-A Armv8-A Armv8-A Armv8-A Armv8-A Armv8-A Armv8-A Armv8-A Armv8-A
Armv8-A