# title
Trusted Base System Architecture for Armv8-A - 3rd Edition

# topic.label
Trusted Base System Architecture for Armv8-A

# metadata.contentDescription
This manual is part of the Arm Platform Security Architecture (PSA) family of specifications. It sets out general requirements for hardware and firmware when designing systems based on Armv8-A processors. This document is now RETIRED. Please refer to the Arm Base System Architecture.