The Instruction Set Architecture (ISA) defines the interface between a computer’s hardware and software interface. It specifies what a processor can do and how it does it – from the set of instructions and supported data types to registers, memory management, and how the OS interacts with the CPU.

The Instruction Set Architecture (ISA) is fundamentally important because it provides standardized language through which software interacts with hardware. It is the blueprints that ensures a program once compiled for specific ISA, can run correctly on any processor adhering to the same architecture. 

For example, AmpereOne® processors support Arm v8.6+ architecture, meaning binaries built for Arm v8.6 can execute correctly on these systems, ensuring software compatibility. 

• Description of Instruction Set Architecture
• Details on the Arm v8.6 Architecture Extension