ARM Cortex-R

The ARM Cortex-R is a family of 32-bit RISC ARM processor cores licensed by Arm Holdings. 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 ARM Cortex-R4(F), ARM Cortex-R5(F), ARM Cortex-R7(F), ARM Cortex-R8(F), and ARM Cortex-R52(F).

ARM Cortex-R
General Info
Designed byARM Holdings
Architecture and classification
Instruction setARMv7-R, ARM (32-bit),
Thumb (16-bit)

Overview
Announced
YearCore
2011Cortex-R4(F)
2011Cortex-R5(F)
2011Cortex-R7(F)
2016Cortex-R8(F)
2016Cortex-R52(F)
See also: ARM architecture and List of ARM cores

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:

The Cortex-R family notably does not have a memory management unit (MMU), and thus cannot use virtual memory.

ARM license

ARM Holdings neither manufactures nor sells CPU devices based on its own designs, but rather licenses the core designs to interested parties. ARM offers a variety of licensing terms, varying in cost and deliverables. To all licensees, ARM provides an integratable hardware description of the ARM core, as well as complete software development toolset and the right to sell manufactured silicon containing the ARM CPU.

Silicon customization

Integrated device manufacturers (IDM) receive the ARM Processor IP as synthesizable RTL (written in Verilog). In this form, they have the ability to perform architectural level optimizations and extensions. This allows the manufacturer to achieve custom design goals, such as higher clock speed, very low power consumption, instruction set extensions, optimizations for size, debug support, etc. To determine which components have been included in a particular ARM CPU chip, consult the manufacturer datasheet and related documentation.

Applications

The Cortex-R is suitable for use in computer-controlled systems where very low latency and/or a high level of safety is required. An example of a hard real-time, safety critical application would be a modern electronic braking system in an automobile. The system not only needs to be fast and responsive to a plethora of sensor data input, but is also responsible for human safety. A failure of such a system could lead to severe injury or loss of life.

Other examples of hard real-time and/or safety critical applications include:

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gollark: If you fund osmarks.net with 81294129046894162481647126412846194 funding, I can buy a TPU and execute it faster.
gollark: I'm asking it about helloboi first. It is very slow.

See also

References
    ARM Cortex-R official documents
    ARM
    Core    		Bit
    Width    		ARM
    Website    		ARM Technical
    Reference Manual    		ARM Architecture
    Reference Manual
    Cortex-R4(F)
    32
    Link
    Link
    ARMv7-R
    Cortex-R5(F)
    32
    Link
    Link
    ARMv7-R
    Cortex-R7(F)
    32
    Link
    Link
    ARMv7-R
    Cortex-R8(F)
    32
    Link
    Link
    ARMv7-R
    Cortex-R52(F)
    32
    Link
    Link
    ARMv8-R
    Migrating
    Other
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