ExperiarSoC

RISC-V SoC designed for the Efabless Open MPW Program. This project

Features

• Dual RV32I cores
• Per core SRAM
• JTAG interface
• External flash controller
• Shared video SRAM
• Configurable VGA output
• 3x UART ports + 1 internal to caravel
• 1x SPI ports
• 4x PWM counters with 4x separate outputs (2 are internal read only)

Memory Map

Macro Layout

Build Status

• CaravelHost: Success
• ExperiarCore: Success
• Flash: Success
• Peripherals: Success
• Video: Success
• WishboneInterconnect: Success
• user_project_wrapper: Success

Several macros have max slew violations.

Tests

RTL

verify-peripheralsGPIO-rtl: Success

verify-peripheralsUART-rtl: Success

verify-peripheralsSPI-rtl: Not implemented

verify-peripheralsPWM-rtl: Not implemented

verify-memory-rtl: Not implemented

verify-video-rtl: Success (Not validating correct pixel data)

verify-corePC-rtl: Success

verify-coreMemory-rtl: Not implemented

verify-coreArch-rtl: Not implemented

GL

verify-peripheralsGPIO-gl: Failed

verify-peripheralsUART-gl: Failed

verify-peripheralsSPI-gl: Not implemented

verify-peripheralsPWM-gl: Not implemented

verify-memory-gl: Not run

verify-video-gl: Not run

verify-corePC-gl: Failed

verify-coreMemory-gl: Not implemented

verify-coreArch-gl: Not implemented

Need to do

• Write remaining tests (and fix everything until they pass)
• Fix timing violations
• Make version of art which passes prechecks

Could do

• Add uart pin swapping
• Flash controller
• JTAG core management controller
• CSRs
• More tests
• Tile map rendering
• Change peripheral bus design to have a read ready signal
• Fetch next instruction a clock cycle earlier so instructions only take 2 cycles

Reference work and inspiration

• Zero to ASIC Course: Complete course on ASIC design. Also has useful references and terminology definitions.
• Openlane Documentation: Reference for a lot of configuration. The Variables and Hardening Macros pages have been particularity useful.
• Caravel Documentation: Reference for caravel and configuration. This seems slightly out of date, but an alternate version can be found in the github repository.
• Riscduino: Used for inspiration and as a reference for using openlane. There are a number of similar aspects to this project, but all have been reimplemented rather than copied.