ARM Cortex-R
Family of microprocessor cores with ARM microarchitecture
The ARM Cortex-R is a family of 32-bit and 64-bit RISC ARM processor cores licensed by ARM Ltd. The cores are optimized for hard real-time and safety-critical applications. Cores in this family implement the ARM Real-time (R) profile, which is one of three architecture profiles, the other two being the Application (A) profile implemented by the Cortex-A family and the Microcontroller (M) profile implemented by the Cortex-M family. The ARM Cortex-R family of microprocessors currently consists of the Cortex-R4(F), Cortex-R5(F), Cortex-R7(F), Cortex-R8(F), Cortex-R52(F), Cortex-R52+(F), and the Cortex-R82(F).
Overview
The ARM Cortex-R is a family of ARM cores implementing the R profile of the ARM architecture; that profile is designed for high performance hard real-time and safety critical applications. It is similar to the A profile for applications processing but adds features which make it more fault tolerant and suitable for use in hard real-time and safety critical applications.
Real time and safety critical features added include:
Tightly coupled memory (uncached memory with guaranteed fast access time)
Increased exception handling in hardware
Hardware division instructions
Memory protection unit (MPU)
Deterministic interrupt handling as well as fast non-maskable interrupts
ECC on L1 cache and buses
Dual-core lockstep for CPU fault tolerance
The Armv8-R architecture includes virtualization features similar to those introduced in the Armv7-A architecture. Two stages of MPU-based translation are provided to enable multiple operating systems to be isolated from one another under the control of a hypervisor.
Prior to the R82, introduced on 4 September 2020, the Cortex-R family did not have a memory management unit (MMU). Models prior to the R82 could not use virtual memory, which made them unsuitable for many applications, such as full-featured Linux.
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