The ARM Cortex-R is a family of 32-bit and 64-bitRISCARM 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 ARM Cortex-R4(F), ARM Cortex-R5(F), ARM Cortex-R7(F), ARM Cortex-R8(F), ARM Cortex-R52(F), ARM Cortex-R52+(F), and ARM Cortex-R82(F).
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)
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,[1] 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.[1] However, many real-time operating systems (RTOS), with an emphasis on total control, have traditionally regarded the lack of an MMU as a feature, not a bug.[1] On the R82, it may be possible to run a traditional RTOS in parallel with a paged OS such as Linux, where Linux takes advantage of the MMU for flexibility, while the RTOS locks the MMU into a direct translation mode on pages assigned to the RTOS so as to retain full predictability for real-time functions.[1]
ARM licenseedit
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 customizationedit
Integrated device manufacturers (IDM) receive the ARM Processor IP as synthesizableRTL (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.
Applicationsedit
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:
^ abcdSalter, Jim (9 September 2020). "Arm's new Cortex-R82 is its first 64-bit real-time processor". arstechnica.com. Ars Technica. Retrieved 11 September 2020.
External linksedit
ARM Cortex-R official documents
ARM Cortex-R official website
ARM Core
Bit Width
ARM Website
ARM Technical Reference Manual
ARM Architecture Reference Manual
Cortex-R4(F)
32
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Link
ARMv7-R
Cortex-R5(F)
32
Link
Link
ARMv7-R
Cortex-R7(F)
32
Link
Link
ARMv7-R
Cortex-R8(F)
32
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Link
ARMv7-R
Cortex-R52(F)
32
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Link
ARMv8
ARMv8-R
Cortex-R52+(F)
32
Link
Link
ARMv8-R
Cortex-R82(F)
64
Link
Link
ARMv8-R (AArch64)
Migrating
Migrating from MIPS to ARM – arm.com
Migrating from PPC to ARM – arm.com
Migrating from IA-32 (x86-32) to ARM – arm.com
Other
CORTEX-R versus CORTEX-M
March 06, 2024
cortex, family, risc, processor, cores, licensed, cores, optimized, hard, real, time, safety, critical, applications, cores, this, family, implement, real, time, profile, which, three, architecture, profiles, other, being, application, profile, implemented, co. 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 ARM Cortex R4 F ARM Cortex R5 F ARM Cortex R7 F ARM Cortex R8 F ARM Cortex R52 F ARM Cortex R52 F and ARM Cortex R82 F ARM Cortex RMediatek MT6280A ARM Cortex R4General informationDesigned byArm Ltd Architecture and classificationInstruction setARMv7 R ARMv8 R ARM 32 bit ARM 64 bit Thumb 16 bit Contents 1 Overview 1 1 ARM license 1 2 Silicon customization 2 Applications 3 See also 4 References 5 External linksOverview edit32 bitYear Core2011 Cortex R4 F 2011 Cortex R5 F 2011 Cortex R7 F 2016 Cortex R8 F 2016 Cortex R52 F 2022 Cortex R52 F 64 bitYear Core2020 Cortex R82 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 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 toleranceThe 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 1 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 1 However many real time operating systems RTOS with an emphasis on total control have traditionally regarded the lack of an MMU as a feature not a bug 1 On the R82 it may be possible to run a traditional RTOS in parallel with a paged OS such as Linux where Linux takes advantage of the MMU for flexibility while the RTOS locks the MMU into a direct translation mode on pages assigned to the RTOS so as to retain full predictability for real time functions 1 ARM license edit 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 edit 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 editThe 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 Medical device Programmable logic controller PLC Electronic control units ECU for a wide variety of applications Robotics Avionics Motion controlSee also edit nbsp Electronics portalARM architecture Interrupt Interrupt handler JTAG SWD List of ARM architectures and cores List of ARM Cortex M development tools Real time operating system Comparison of real time operating systemsReferences edit a b c d Salter Jim 9 September 2020 Arm s new Cortex R82 is its first 64 bit real time processor arstechnica com Ars Technica Retrieved 11 September 2020 External links editARM Cortex R official documentsARM Cortex R official websiteARMCore BitWidth ARMWebsite ARM TechnicalReference Manual ARM ArchitectureReference ManualCortex R4 F 32 Link Link ARMv7 RCortex R5 F 32 Link Link ARMv7 RCortex R7 F 32 Link Link ARMv7 RCortex R8 F 32 Link Link ARMv7 RCortex R52 F 32 Link Link ARMv8ARMv8 RCortex R52 F 32 Link Link ARMv8 RCortex R82 F 64 Link Link ARMv8 R AArch64 MigratingMigrating from MIPS to ARM arm com Migrating from PPC to ARM arm com Migrating from IA 32 x86 32 to ARM arm comOtherCORTEX R versus CORTEX M Retrieved from https en wikipedia org w index php title ARM Cortex R amp oldid 1186546432, wikipedia, wiki, book, books, library,
