Expansion Card Retrofit

📘 Project ExAce

[!Warning]

Content is not proven and suject to change without notice! Send to fab at your own risk.

🧩 Overview

A tiny yet powerful fpga acceleration card designed with the Framework laptop expansion module system in mind.

🛠️ Features

• ✅ CCGM1A1/2/4 compatible
• ✅ 20,480, 40,960 or 81,920 8-input LUT-trees.
• ✅ USB-type C, 5V 1.5A.
• ✅ Full access to SERDES via the USB-c connector (1 for A1/A2 and 2 for A4 device).
• ✅ USB2.0 interface is shared between the fpga and mcu via a USB mux.
• ✅ STM32L422RBI6 coprocessor and programmer.
• ✅ Shared Earth and i2c between the fpga and microcontroller for easier development.
• ✅ Free and Open-source FPGA toolchain!
• ✅ Lots of sensors!: PDM microphone, 6DoF imu, magnetometer, and thermometer.
• ✅ 8 user programmable led ideal for VU meters.
• ✅ 1 lvds IO ideal for connecting multiple board together in a cluster.
• 🔜 TinyFPGA-Bootloader support TBD.
• 🔜 DirtyJTAG support TBD.

💪 Application

• ✅ Machine learning
• ✅ Simulation
• ✅ Audio/Signal processing
• ✅ Retro Gaming
• ✅ Development platform

🗂️ Repository Structure

📁 /pcb-project-root
├── /3D_Models                    # 3D models of the PCB rendering
├── /Outputs/Fabrication          # Generated Gerber files, BOM and POS for fabrication
├── /PINOUT                       # STM32CubeMx for reference pinout
├── /Testbench/ExAceTestbench     # Testbench to break out serdes signals
├── /.gitignore
└── README.md

🧰 Tools & Dependencies

• Design Software: KiCad (v9.0.2 or higher)
• MCU/FPGA Programmer: ST-Link,Pico Dirty JTAG
• Firmware Toolchain: STM32CubeMX, arm toolchain, Colonge chip open source toolchain

🖼️ 3D view

🏗️ Getting Started

1. Clone this repository

   git clone https://github.com/cdg66/ExAce.git

2. Open the project in KiCad (navigate to Expansion_Card_Retrofit.kicad_pro)
3. Modify / Build / Export Gerbers

🚀 Fabrication

To get the board fabricated:

• Use the files in the /Outputs directory
• Recommended fabs:
  • NextPcb
  • JLCPCB

Stack-up:

The recommended stack up is the JLC08081H-1080A at JLCPCB but can be done at any other PCB manufacturer.

🔧 License

This work is licensed under a Creative Commons Attribution 4.0 International License.

This project references and builds upon the open-source designs from
FrameworkComputer/ExpansionCards,
which is also licensed under the Creative Commons Attribution 4.0 International License (CC-BY-4.0).

TPSM82822SILR

Footprint: Ultralibrarian

3D model: SnapMagic

Edited by me

S3A2505-100.000-L-X1-R

Symbol, Footprint, 3D model: SnapMagic

Edited by me

1054440011

3D model: Molex

KXT_331_LHS

3D model: SnapMagic

STM32L422RBI6

3D model: SnapMagic

TPS7A2033PDQNR

3D model: SnapMagic