The Potato Processor
The Potato Processor is a simple RISC-V processor for use in FPGAs. It implements the 32-bit integer subset of the RISC-V specification version 2.0 and supports the machine mode and the Mbare addressing environment of the RISC-V privileged architecture, version 1.7.
The processor has been tested on a Nexys 4 board using the example design provided in the example/ directory
and the SHA-256 application from the benchmarks/ directory.
Features
- Supports the complete 32-bit RISC-V base integer ISA (RV32I) version 2.0.
- Supports machine mode and the Mbare addressing environment defined in the RISC-V privileged architecture version 1.7.
- Supports up to 8 individually maskable external interrupts.
- Classic 5-stage RISC pipeline
- Supports the Wishbone bus
- Includes an instruction cache
Peripherals
The Potato processor includes a variety of Wishbone-compatible peripherals for use in projects. The peripherals are:
- Timer - a 32-bit timer with compare interrupt
- GPIO - a configurable-width generic GPIO module
- Memory - a block RAM memory module
- UART - a simple UART module with hardware FIFOs
- 7-Segment - a 7-segment display module, supporting up to 8 displays
Quick Start/Instantiating
To instantiate the processor, add the source files from the src/ folder to your project. Use the pp_potato
entity to instantiate a processor with a wishbone interface. Generics are provided to enable/disable the
instruction cache and to specify which areas of memory can be cached.
An example project providing a simple Potato-based SoC is available in the examples/ directory.