Efficient microcontroller core with a 5-stage in-order pipeline, privilege modes, an FPU, an MPU, L1 and L2 caches

SCR4 is a 32/64-bit RISC-V low-power, high-performance, area-optimized processor core with floating-point arithmetic functionality.

The SCR4 core fully supports RISC-V standard "I" Integer, "M" Integer Multiplication and Division, "A" Atomic, "C" 16-bit Compressed, "F" Single-Precision Floating-Point, "D" Double-Precision Floating-Point, “B” Bit Manipulation, and “K” Scalar Cryptography extensions. SCR4 includes an in-order 5-stage pipeline, a floating-point unit, a branch prediction unit for efficient code execution, separate L1 instruction and data caches, PLIC, ACLINT, IPIC/CLIC units for efficient interrupt processing, and industry-standard AHB, AXI4, JTAG, and cJTAG interfaces increasing flexibility and compatibility.

The SCR4 memory subsystem includes a TCM unit, L1 and L2 caches, an MPU unit and supports seamless execution of various real-time operating systems. The processor core can operate in heterogenous multicore (up to 4 cores in a cluster) environments, offering hardware-level support for memory coherency and simplified external accelerators integration.

SCR4 Key Features

Development Tools

Syntacore Development Toolkit (SCR4 Optimized)

The SC-DT package is a ready-to-use software development kit containing pre-built and pre-configured tools that simplify software development for the SCR4 core. With SC-DT, you can take advantage of the pre-built tools and configurations to reduce the time and effort required to get up and running with SCR4. SC-DT supports Windows and Linux operating systems and includes:

• Eclipse IDE and Visual Studio Code plugin
• Compilers (GCC, clang/LLVM with microarchitecture optimizations)
• Debuggers (GDB, OCD)
• Simulator (QEMU)
• FreeRTOS
• HAL and BSP
• Application examples
• Benchmarks
• Documentation

Syntacore also supports and maintains the Zephyr operating system that is not part of the SC-DT package and is downloadable separately.

• Industrial automation
• Internet of things
• Mobile
• Smart sensors
• Automotive
• Smart home

SCR4 is available out-of-the-box, configurable, written in SystemVerilog and comes with a full set of pre-built, tested, and optimized development tools, pre-configured FPGA-based SDK and complete documentation. The software package includes ready-to-use toolchains, IDEs, operating systems, bootloaders, debuggers, simulators, and sample projects that reduce the time and effort required to get up and running with SCR4.

The SCR4 product package includes:

• RISC-V-compatible Core
  • System Verilog RTL source code (encrypted for evaluation stage, all major EDA tool vendors are supported)
  • Netlist for the required FPGA devices (Xilinx/Altera)
• Syntacore Development Toolkit (downloaded separately)
  • Toolchains
  • OS and bootloaders
  • IDEs
  • Debuggers
  • Simulator
  • Software example projects, HAL and BSP
• FPGA-based SDK
  • Sample FPGA projects
  • Pre-build FPGA images
• Integration Verification Environment (IVE)
  • Verification test suite for the pre-silicon (RTL simulation-based)
  • Post-silicon validation and testing (pre-si and post-si tests)
• Synthesis Reference Scripts
  • Reference scripts
  • SDC constraint files
• Comprehensive Documentation
  • User Manual (quick start guide)
  • External Architecture Specification (EAS)
  • Instruction Set Manual (ISM)
  • Integration Verification Environment (IVE) manual
  • SDK User Guide
  • Tools Guide (IDE, CLI)