Specifications

The Cortex-R7 processor features an 11-stage, superscalar, out-of-order pipeline with dynamic and static branch prediction, dynamic register re-naming and non-blocking Load-Store Unit. There is also an integrated Generic Interrupt Controller (GIC), Snoop Control Unit (SCU) and timers to further reduce latency and enable symmetric multiprocessing in a dual core configuration.

Cortex-R7 is not suggested for new designs. This page is for legacy purposes only. The Cortex-R8 is recommended for an alternative real-time processor.

Cortex-R7 Block Diagram.

Arm Cortex-R7 processor

Architecture Armv7-R
Instruction Set Arm and Thumb-2. Supports DSP instructions and optional Floating-Point Unit with single-precision or double precision.
Microarchitecture 11-stage pipeline with instruction pre-fetch, branch prediction, superscalar and out of order execution, register renaming, parallel execution paths for load-store, MAC, shift-ALU, divide and floating-point.
Cache controllers Harvard memory architecture with optional integrated Instruction and Data cache controllers. Cache sizes configurable from 4 to 64KB. Cache lines are write-through.

Tightly-Coupled Memories Optional Tightly-Coupled Memory interfaces are for highly deterministic or low-latency applications that may not respond well to caching (e.g. instruction code for interrupt service routines and data that requires intense processing). Instruction and/or data TCMs. TCM size can be up to 128KB.
Interrupt Interface Standard interrupt, IRQ, non-maskable fast interrupt, FIQ, inputs are provided together with a fully integrated Generic Interrupt Controller (GIC) supporting complex priority-based interrupt handling. The processor includes low-latency interrupt technology that allows long multi-cycle instructions to be interrupted and restarted. Deferral of lengthy memory accesses occurs in certain circumstances.
Memory Protection Unit (MPU) Optional MPU configures attributes for up to sixteen regions, each with resolution down to 256 Bytes. Regions can overlap, and the highest numbered region has highest priority.

Floating-Point Unit (FPU) Optional FPU implements the Arm Vector Floating Point architecture VFPv3 with 16 double-precision registers, compliant with IEEE754. There is support for two FPU options: either a single precision-only or both single and double precision. The FPU performance is optimized for both single and double precision calculations. Operations include add, subtract, multiply, divide, multiply and accumulate, square root, conversions between fixed and floating-point, and floating-point constant instructions.
ECC Optional single-bit error correction and two-bit error detection for cache and/or TCM memories and all interfaces with ECC bits. Single-bit soft errors are automatically corrected by the processor. In addition, full and flexible support for managing hard errors.
Master AMBA AXI bus 64-bit AMBA AXI bus master for Level-2 memory and peripheral access.
Slave AXI bus Optional 64-bit AMBA AXI bus slave port allows DMA masters to access the TCMs for high speed streaming of data in and out of the processor.
Low Latency Peripheral Port (LLPP) A dedicated 32-bit AMBA AXI port to integrate latency-sensitive peripherals more tightly with the processor.
Accelerator Coherency Port (ACP) A 64-bit AMBA AXI slave port to enable coherency between the processor(s) and external intelligent peripherals such as DMA controllers, Ethernet or Flexray interfaces.
Low latency memory port A 64-bit AMBA AXI master port designed specifically to connect to local memory. This local memory provides many of the benefits of TCM and in addition can be slower and lower power and also easily shared between coherent peripherals and the one or two Cortex-R7 processor cores.
Dual-core A dual processor configuration for either a redundant Cortex-R7 CPU in lock-step for fault tolerant/fault detecting dependable systems or dual cores running independently, each executing its own program with its own bus interfaces, interrupts etc.
Debug Debug Access Port is provided. Its functionality can be extended using CoreSight SoC-400.
Trace An interface suitable for connection to CoreSight Embedded Trace Module is present.


Characteristics

Processor area, frequency and power consumption are highly dependent on process, libraries and optimizations. The table below estimates a typical single processor implementation of the Cortex-R7 processor on mainstream high performance for mobile process technology (28nm HPM) with high-density, standard-performance cell libraries and 32KB instruction cache and 32KB data cache.

Single processor systems

28 nm HPM

Maximum Clock frequency Above 1.5 GHz
Performance 2.50 / 2.90 / 3.77 DMIPS/MHz *
4.62 CoreMark/MHz**
Total area (Including Core+RAM+Routing) From 0.33 mm2
Efficiency From 46 DMIPS/mW

* The first result abides by all of the 'ground rules' laid out in the Dhrystone documentation, the second permits inlining of functions (not just the permitted C string libraries) while the third additionally permits simultaneous multifile compilation. All are with the original (K&R) v2.1 of Dhrystone.

** CFLAGS ="--endian=little --cpu=Cortex-R7 --fpu=None -Ohs --no_size_constraints"


Cortex-R comparison table

Download the following PDF datasheet to compare the specifications of Cortex-R processors.

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