// SPDX-FileCopyrightText: 2020 Efabless Corporation // // Licensed under the Apache License, Version 2.0 (the “License”); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an “AS IS” BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // SPDX-License-Identifier: Apache-2.0

BrqRV EB1 RISC-V Core 1.0 from MERL

This repository contains the BrqRV EB1 Core design RTL. BrqRV EB1 Is A Machine-Mode (M-Mode) Only, 32-Bit Cpu Small Core Which Supports Risc-V’s Integer (I), Compressed Instruction (C), Multiplication And Division (M), And Instruction-Fetch Fence, And Csr Extensions. The Core Contains A 4-Stage, Scalar, In-Order Pipeline

Block Diagram

Directory Structure

├── verlog                          #   User verilog Directory
│   ├── rtl                         #   RTL
│   ├── dv                          #   Design Verification
│   ├── gl                          #   Gate Level Netlis

The BrqRV_EB1 Source Code is avaialable here

├── verlog                               #   User verilog Directory
│   ├── rtl                              #   RTL
|       ├── user_project_wrapper.v       #   User Project Wrapper source file
|       ├── user_proj_example.v          #   User Project Example source file
|       ├── Brqrv_EB1                    #   BrqRV_EB1 folder
|           ├── Brqrv_EB1.v                                     #   BrqRV_EB1 source file
|           ├── sky130_sram_1kbyte_1rw1r_32x256_8.v             #   1KB sram

The Design Verification Testbench is available here

├── verlog                               #   User verilog Directory
│   ├── dv                               #   Design Verification
│       ├── BrqRV_EB1                    #   Design Test Directory
│       ├── hex                          #   Hex files folder
│       ├── asm                          #   Assmebly files folder

The synthesized netlist is present here:

├── verlog                               #   User verilog Directory
│   ├── gl                               #   Gate Level Netlis
│       ├── user_project_wrapper.v       #   User Project Wrapper Netlist
│       ├── user_proj_example.v          #   User Project Example Netlist

The hardened macros are placed here:

├── def                                 #    def Directory
│   ├── user_project_wrapper.def        #    User Project Wrapper def file

├── lef                                 #    lef Directory
│   ├── user_project_wrapper.lef        #    User Project Wrapper lef file
│   ├── user_proj_example.lef           #    User Project Example lef file

├── gds                                 #    gds Directory
│   ├── user_project_wrapper.gdz.gz     #    User Project Wrapper gds
│   ├── user_proj_example.gdz.gz        #    User Project Example gds

Testing of Design

Go to verilog/dv/BrqRV_EB1/ directory

  1. Set the GCC_PATH environment variable.
  2. Set the PDK_PATH environment variable.
  3. Copy the given program hex file into uart.hex.
  4. run the make commad for RTL simulation
  5. run the SIM=GL make command for netlist simulation

Note: Dont forget to add 00000FFF instruction in the end of the uart.hex to stop the uart transmission if you are using your own codes.