32 Bit - Embedded RISC-V Processor Core

Overview

The L31(F) is a small, efficient 32-bit embedded RISC-V processor aimed at embedded systems with more modest processing requirements. The core has a 3-stage pipeline and has 32 general-purpose registers.
The core includes optional L1 data and instruction caches, optional instruction and data TCM, optional 8 or 16 PMP regions, an interrupt controller and RISC-V Debug module optionally with PC trace.
Like with all Codasip RISC-V cores, it is possible to create custom instructions using Codasip Studio to extend the L31 and to generate corresponding hardware and software development kits.

Key Features

32-bit RISC-V core
Available in two versions:
- RV32IMC
- RV32IMCF
32 general purpose registers
Either parallel multiplier
3-stage pipeline
Dynamic branch predictor
RISC-V privilege mode support:
- Machine, User
Internal interrupt controller
- Up to 256 sources
Optional FPU (L30F)
Optional instruction and data tightly coupled memories (TCM)
Optional 8 or 16 PMP regions
Optional L1 data and instruction caches
Standard RISC-V CLINT
- Up to 256 sources
Wakeup interrupt controller
NMI
On-chip debugger
- RISC-V Debug module
2/4 pin JTAG
2-8 breakpoints/watchpoints

Benefits

Flexibility
- Wide choice of configuration options.
Customization
- Ability to create custom RISC-V extensions to optimise performance
- Efficient architectural exploration of custom extensions with Studio
- Automatic HDK and SDK generation from Studio
- Rigorous verification of modified L31 core using UVM
Tensor Flow Lite Micro is supported

Block Diagram

Applications

The L31 is aimed at low- to mid-range embedded applications such as IoT, always on sensors, wireless connectivity, audio, motor control and display control.

Deliverables

Human-readable and structured RTL in either:
- Verilog
- VHDL
- System Verilog
Hardware development kit (HDK)
- Synthesis scripts
- Simulation testbenches
- Debug support
Software development kit (SDK)
- LLVM C-compiler
- Assembler
- Disassembler
- Linker
- Instruction-accurate simulator
- Cycle-accurate simulator
- Profiler
Option for extending L31
- CodAL model for Codasip Studio

Technical Specifications

Foundry, Node

Any

Availability

Now

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