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tillitis-key/doc/system_description/boards.md
Daniel Lublin 726bbcd15c
Capitalize consistently 
Signed-off-by: Daniel Lublin <daniel@lublin.se>
2022-11-30 14:23:44 +01:00

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Tillitis PCB designs

Introduction

Tillitis develop boards (PCBs) and enclposures for the TKey devices as well support systems such as FPGA programmers. Tillitis use open source tools for the PCB designs.

Boards

The KiCad board projects all follow this directory structure:

Path Description
/project KiCad 6 project
/project/gerbers PCB release files
/project/test Scripts / gateware used for production tests

TKey 1 (TK1)

This is the first production version of the TKey design.

Main features:

  • Miniaturized hardware the size of a small USB stick.

  • The Interface FPGA from the MTA1-USB-DEV design has been replaced with an Interface MCU running a USB-to-Serial converter firmware. This was done to ease development of the FPGA design.

  • A touch sensor IC is provided instead of the switch for user presence detection.

  • Test pads are provided on the bottom of the board for programming the SPI flash, and also for measuring extra GPIO pins. The 'MTA1-USB-V1-Programmer' board is designed to support this.

mta1-usb-v1-programmer

This is a programming jig for TKey 1 (the mta1-usb-v1) board The progamming board is based around a on a Raspberry Pi Pico running a custom firmware developed by Blinkinlabs.

The source code for this firnware is available on Github. There is also a pre built firmware binary available for the programmer board

mta1-usb-dev

This is the original TKey design, intended as a development platform. It is a larger PCB, that connects to a PC via a USB C cable.

Main features:

  • 2 ICE40 FPGAs.

  • The first ICE40 (Interface FPGA) is connected to a USB C plug, and is loaded with a gateware that contains a soft USB device. This gateware acts as an USB-to-GPIO interface to the second ICE40.

  • The second ICE40 (application FPGA) is loaded with a RISC-V soft core containing the security firmware. User applications are run on this gateware.

  • The second ICE40 also has an input button for user presenence detection.

  • An FTDI module is included for programming both the Application and Interface FPGAs.

  • Both ICE40s can be configured to boot from included SPI flash memories, NVCM, or be live programmed from the FTDI module.

  • All GPIO lines between the two FPGAs, as well as all programming signals, are exposed on 0.1" headers for probing.

Libraries

mta1-library

This is a shared KiCad library for all boards in the project.

KiCad-RP Pico

This is a KiCad library for the Raspberry Pi Pico symbol and footprint. It was extracted from the Kicad-RP-Pico project. It is licensed under the Creative Commons CC-BY-SA 4.0 License, with an exception exempting waving any control of derived works.