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Openlane2 Installation

It takes a long time build!

This is intended behaviour as the Openlane2 builds from scratch - using your computer to compile the entire program.

False-Alarm Deprecated issues

nix-shell --pure ~/openlane2/shell.nix

Workaround

Add this setting onto the command.

--extra-deprecated-features url-literals

GitHub Rate Limit

You may run into a rate limitation from GitHub.

Workaround

Two ways for the workaround:

  • Wait for some minutes and retry again! It just means that people are overloading the GitHub API.
  • Use the GitHub token to avoid the rate limit. You can provide a GitHub token by following the instructions here, where you can set the token as an environment variable export GITHUB_TOKEN="ghp_YOUR_TOKEN_HERE" and run the command again.

SiliWiz

  • Make sure you use "in", "Vdd", "Vss" as input, power and ground respectively to make sure that the SPICE simulator built into the SiliWiz works as intended.
  • Make sure that you have added the "via" layer between the silicon and the metal.
  • The current through the gate is proportional to the width and height of the polysilicon, which means that the thinner and smaller the gate, the more current can go through it.
  • Higher the capacitance, the less steep the voltage drop after the charge, so you need to zoom in really deep to see the drop than the given example gives.

TinyTapeout

'docs' Build Failure

Ensure that the info.yaml file has every entry but the Discord filled in the .yaml, ensure that the indentation is preserved. Also make sure that /docs/info.md has each subheader filled with different information other than the default given one as otherwise it will fail the build.

'gds' Build Failure

Run ./tt/tt_tool.py --create-user-config
2025-02-18 07:28:24,712 - project    - ERROR    - Error loading /home/runner/work/ta-test-run/ta-test-run/info.yaml: Top module must start with 'tt_um_' (e.g. tt_um_my_project)
Error: Process completed with exit code 1.

Ensure that top module of the verilog project starts with 'tt_um_*'.

"Missing Ports"

2025-02-18 09:12:31,901 - project    - ERROR    - [000 : unknown] port 'ena' missing from top module ('tt_um_up_down_counter')
2025-02-18 09:12:31,901 - project    - ERROR    - [000 : unknown] port 'rst_en' missing from top module ('tt_um_up_down_counter')
..
2025-02-18 09:12:31,901 - project    - ERROR    - [000 : unknown] port 'ui_in' missing from top module ('tt_um_up_down_counter')

TinyTapeout has hard-typed inputs and outputs. You need to make sure that the ports in your Verilog file match the ports in the template. Here are the following "missing ports" to the top module in your implementation.

    input  wire [7:0] ui_in,    // Dedicated inputs
    output wire [7:0] uo_out,   // Dedicated outputs
    input  wire [7:0] uio_in,   // IOs: Input path
    output wire [7:0] uio_out,  // IOs: Output path
    output wire [7:0] uio_oe,   // IOs: Enable path (active high: 0=input, 1=output)
    input  wire       ena,      // always 1 when the design is powered, so you can ignore it
    input  wire       clk,      // clock
    input  wire       rst_n     // reset_n - low to reset

SBT

SBT Java Version - Error compiling the sbt component 'compiler-bridge_2.13'

System Dependent

IntelliJ IDEA

In order to force the SBT to use the Java version (which currently supported is 11) which is able to compile the compiler bridge component, then you need to do the following:

  • Change the Project SDK to Java 11 by File -> Project Structure -> Project Settings -> SDKs, select the + and add the Java 11 SDK either using your own or download it from the IDE.
  • Change the Build Tool (sbt) SDK to chosen Java 11 SDK by Settings -> Build, Execution, Deployment -> Build Tools -> sbt, select the jre and pick the Java 11 SDK.
WSL (Windows Subsystem for Linux)

Assuming the supported version, in order to install OpenJDK 11 and set it as the default Java version in WSL, follow these steps:

  1. Update your package list:

    sudo apt update

  2. Install OpenJDK 11:

    sudo apt install openjdk-11-jdk

  3. Verify the installation:

    java -version

  4. Add the JAVA_HOME variable to your shell configuration file (e.g., .bashrc or .zshrc) to make it persistent, please note and replace YOURSYSTEM with your system architecture, like :

    echo 'export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-YOURSYSTEM' >> ~/.bashrc
source ~/.bashrc