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Caravel Analog User Project
===========================
|License| |User CI| |Caravan Build|
Table of contents
=================
- `Overview <#overview>`__
- `Install Caravel <#install-caravel>`__
- `Caravel Integration <#caravel-integration>`__
- `User Project: Power on Reset <#user-project-power-on-reset>`_
- `Verilog Integration <#verilog-integration>`__
- `Running Full Chip Simulation <#running-full-chip-simulation>`__
- `Other Miscellaneous Targets <#other-miscellaneous-targets>`_
- `Checklist for Open-MPW
Submission <#checklist-for-open-mpw-submission>`__
Overview
========
This repo contains a sample user project that utilizes the caravan chip (analog version of `caravel <https://github.com/efabless/caravel.git>`__) user space. The user project is a simple power-on-reset that showcases how to make use of caravan's user space utilities like IO pads, logic analyzer probes, and wishbone port. The repo also demonstrates the recommended structure for the open-mpw **analog** projects.
Install Caravel
===============
To setup caravel, run the following:
.. code:: bash
# By default, CARAVEL_ROOT is set to $(pwd)/caravel
# If you want to install caravel at a different location, run "export CARAVEL_ROOT=<caravel-path>"
# Disable submodule installation if needed by, run "export SUBMODULE=0"
git clone https://github.com/efabless/caravel_user_project_analog.git
cd caravel_user_project_analog
make install
To update the installed caravel to the latest, run:
.. code:: bash
make update_caravel
To remove caravel, run
.. code:: bash
make uninstall
By default
`caravel-lite <https://github.com/efabless/caravel-lite.git>`__ is
installed. To install the full version of caravel, run this prior to
calling make install.
.. code:: bash
export CARAVEL_LITE=0
Caravel Integration
=====================
User Project: Power on Reset
----------------------------
> :construction: Under construction :construction:
Verilog Integration
-------------------
You need to create a wrapper around your macro that adheres to the
template at
`user\_analog_project\_wrapper <https://github.com/efabless/caravel/blob/master/verilog/rtl/__user_analog_project_wrapper.v>`__.
The wrapper top module must be named ``user_analog_project_wrapper`` and must
have the same input and output ports as the analog wrapper template. The wrapper gives access to the
user space utilities provided by caravel like IO ports, logic analyzer
probes, and wishbone bus connection to the management SoC.
Building the PDK
================
You have two options for building the pdk:
- Build the pdk natively.
Make sure you have `Magic VLSI Layout Tool <http://opencircuitdesign.com/magic/index.html>`__ `version 8.3.160 <https://github.com/RTimothyEdwards/magic/tree/8.3.160>`__ installed on your machine before building the pdk.
.. code:: bash
# set PDK_ROOT to the path you wish to use for the pdk
export PDK_ROOT=<pdk-installation-path>
# you can optionally specify skywater-pdk and open-pdks commit used
# by setting and exporting SKYWATER_COMMIT and OPEN_PDKS_COMMIT
# if you do not set them, they default to the last verfied commits tested for this project
make pdk
- Build the pdk using openlane's docker image which has magic installed.
.. code:: bash
# set PDK_ROOT to the path you wish to use for the pdk
export PDK_ROOT=<pdk-installation-path>
# you can optionally specify skywater-pdk and open-pdks commit used
# by setting and exporting SKYWATER_COMMIT and OPEN_PDKS_COMMIT
# if you do not set them, they default to the last verfied commits tested for this project
make pdk-nonnative
Running Full Chip Simulation
============================
First, you will need to install the simulation environment, by
.. code:: bash
make simenv
This will pull a docker image with the needed tools installed.
To install the simulation environment locally, refer to <https://github.com/efabless/caravel_user_project_analog/blob/main/verilog/dv/README.md>`__
Then, run the RTL and GL simulation by
.. code:: bash
export PDK_ROOT=<pdk-installation-path>
export CARAVEL_ROOT=$(pwd)/caravel
# specify simulation mode: RTL/GL
export SIM=RTL
# Run the mprj_por testbench, make verify-mprj_por
make verify-<testbench-name>
The verilog test-benches are under this directory
`verilog/dv <https://github.com/efabless/caravel_user_project_analog/tree/main/verilog/dv>`__.
Running Open-MPW Precheck Locally
=================================
You can install the precheck by running
.. code:: bash
# By default, this install the precheck in your home directory
# To change the installtion path, run "export PRECHECK_ROOT=<precheck installation path>"
make precheck
This will clone the precheck repo and pull the latest precheck docker image.
Then, you can run the precheck by running
Specify CARAVEL_ROOT before running any of the following,
.. code:: bash
# export CARAVEL_ROOT=$(pwd)/caravel
export CARAVEL_ROOT=<path-to-caravel>
make run-precheck
This will run all the precheck checks on your project and will retain the logs under the ``checks`` directory.
Other Miscellaneous Targets
============================
The makefile provides a number of useful that targets that can run compress, uncompress, and run XOR checks on your design.
Compress gds files and any file larger than 100MB (GH file size limit),
.. code:: bash
make compress
Uncompress files,
.. code:: bash
make uncompress
Specify ``CARAVEL_ROOT`` before running any of the following,
.. code:: bash
# export CARAVEL_ROOT=$(pwd)/caravel
export CARAVEL_ROOT=<path-to-caravel>
Run XOR check,
.. code:: bash
make xor-analog-wrapper
Checklist for Open-MPW Submission
=================================
|:heavy_check_mark:| The project repo adheres to the same directory structure in this repo.
|:heavy_check_mark:| The project repo contain info.yaml at the project root.
|:heavy_check_mark:| Top level macro is named ``user_analog_project_wrapper``.
|:heavy_check_mark:| Full Chip Simulation passes for RTL and GL (gate-level)
|:heavy_check_mark:| The hardened Macros are LVS and DRC clean
|:heavy_check_mark:| The ``user_analog_project_wrapper`` adheres to empty wrapper template order specified at `user_analog_project_wrapper_empty <https://github.com/efabless/caravel/blob/master/mag/user_analog_project_wrapper_empty.mag>`__
|:heavy_check_mark:| XOR check passes with zero total difference.
|:heavy_check_mark:| Open-MPW-Precheck tool runs successfully.
.. |License| image:: https://img.shields.io/badge/License-Apache%202.0-blue.svg
:target: https://opensource.org/licenses/Apache-2.0
.. |User CI| image:: https://github.com/efabless/caravel_user_project_analog/actions/workflows/user_project_ci.yml/badge.svg
:target: https://github.com/efabless/caravel_user_project_analog/actions/workflows/user_project_ci.yml
.. |Caravan Build| image:: https://github.com/efabless/caravel_user_project_analog/actions/workflows/caravan_build.yml/badge.svg
:target: https://github.com/efabless/caravel_user_project_analog/actions/workflows/caravan_build.yml