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55 lines
2.4 KiB
Markdown
55 lines
2.4 KiB
Markdown
# MTA1-USB PCB designs
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## Boards
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The KiCad board projects all follow this directory structure:
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| Path | Description |
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| --- | --- |
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| /project | KiCad 6 project |
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| /project/gerbers | PCB release files |
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| /project/test | Scripts / gateware used for production tests |
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### mta1-usb-v1
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This is the first production version of the MTA1-USB design.
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Main features:
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* Miniaturized hardware the size of a small USB stick.
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* 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.
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* A touch sensor IC is provided instead of the switch for user presence detection.
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* 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.
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### mta1-usb-v1-programmer
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This is a programming jig for the mta1-usb-v1 board.
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### mta1-usb-dev
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This is the original design, intended as a development platform. It is a larger PCB, that connects to a PC via a USB C cable.
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Main features:
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* 2 ICE40 FPGAs.
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* 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.
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* The second ICE40 (application FPGA) is loaded with a RISC-V soft core containing the security firmware. User applications are run on this gateware.
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* The second ICE40 also has an input button for user presenence detection.
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* An FTDI module is included for programming both the Application and Interface FPGAs.
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* Both ICE40s can be configured to boot from included SPI flash memories, NVCM, or be live programmed from the FTDI module.
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* All GPIO lines between the two FPGAs, as well as all programming signals, are exposed on 0.1" headers for probing.
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## Libraries
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### mta1-library
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This is a shared KiCad library for all boards in the project.
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### KiCad-RP Pico
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This is a KiCad library for the Raspberry Pi Pico symbol and footprint. It was extracted from the [Kicad-RP-Pico](https://github.com/ncarandini/KiCad-RP-Pico) project. It is licensed under the [Creative Commons CC-BY-SA 4.0 License](https://creativecommons.org/licenses/by-sa/4.0/legalcode), with an exception exempting waving any control of derived works.
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