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LEXICON RISC-V Core 1.0 from MERL This repository contains the Lexicon Core design RTL. Lexicon 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

Directory Structure

├── verlog                          #   User verilog Directory

  │   ├── rtl                         #   RTL

  │   ├── dv                          #   Design Verification

  │   ├── gl                          #   Gate Level Netlist

The Lexicon 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

  |  ├── Lexicon                    #   Lexicon folder

    |    ├── Lexicon.v                                     #   Lexicon 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

    │      ├── Lexicon                    #   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/Lexicon/ directory

Set the GCC_PATH environment variable. Set the PDK_PATH environment variable. Copy the given program hex file into uart.hex. run the make commad for RTL simulation 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.