Explore the latest Arm A-profile architectures, including descriptions in XML and HTML formats and release notes.

The XML architectural feature names are in a new format. See A-profile feature names for a list of the old and new feature names.

Arm Architecture System Registers

Arm A64 Instruction Set Architecture

Arm A32/T32 Instruction Set Architecture

This package provides descriptions in XML and HTML format for the system registers and memory-mapped registers. This package provides descriptions in XML and HTML format for the A64 Instruction Set Architecture. This package provides descriptions in XML and HTML format for the A32 and T32 Instruction Set Architecture.

Armv8-A 2020-12

Release notes   
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Release notes Download XML  Release notes 
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Future Architecture Technologies 2020-12*

Release notes  
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Release notes Download XML   

Release notes             
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* Future Architecture Technologies are not released architectures but advanced information and guidance for the OS and tools developer ecosystems. The purpose of this early disclosure is to ensure support will be widely available by the time CPUs which deploy these new technologies become available. 

Arm Glossary

The Arm Glossary provides a list of terms used in Arm technical content. Access the Arm Glossary to help your understanding of Arm technical content.

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