Device Overview
---------------

Top View
~~~~~~~~

.. image:: ../../images/cynthion-top.svg
  :width: 300
  :alt: Cynthion Top View

- **A-E** - Five status LEDs managed by the debug microcontroller.

    - **A** - Power Indicator.
    - **B** - FPGA is online.
    - **C** - FPGA has requested control of the  **CONTROL** port.
    - **D** - FPGA has control of the **CONTROL** port.
    - **E** - Reserved for future use.

- **0-5** - Six USER LEDs managed by the FPGA.


Left View
~~~~~~~~~

.. image:: ../../images/cynthion-left.svg
  :width: 400
  :alt: Cynthion Left View

- **PROGRAM** - Press this button to return control of the **CONTROL** port to the debug microcontroller and hold the FPGA in an unconfigured state.

    - *Recovery mode*: Press this button during power-on to invoke the `Saturn-V <https://github.com/greatscottgadgets/saturn-v>`__ bootloader on the **CONTROL** port.

- **CONTROL**  - Primary USB connector used by the host computer to control Cynthion.
- **USER**     - A user-assignable button that can be used in your own designs.
- **AUX**      - An auxiliary USB connection that can be used in your own designs.


Right View
~~~~~~~~~~

.. image:: ../../images/cynthion-right.svg
  :width: 400
  :alt: Cynthion Right View

- **TARGET C** - USB Type-C connector for Packetry traffic capture and Facedancer device emulation.
- **TARGET A** - USB Type-A connector shared with the **TARGET C** connector.
- **RESET**    - Press this button to reset Cynthion's debug microcontroller and reconfigure the FPGA from flash.


Front View
~~~~~~~~~~

.. image:: ../../images/cynthion-front.svg
  :width: 400
  :alt: Cynthion Front View

- **A & B** - Two Digilent Pmod™ Compatible I/O connectors for a total of 16 high-speed FPGA user IOs.

    - **B** can also be configured to act as a serial port and JTAG connector for debugging SoC designs:

        - **1**  - SERIAL RX
        - **2**  - SERIAL TX
        - **7**  - JTAG TMS
        - **8**  - JTAG TDI
        - **9**  - JTAG TDO
        - **10** - JTAG TCK



Bottom View
~~~~~~~~~~~

.. image:: ../../images/cynthion-bottom.svg
  :width: 300
  :alt: Cynthion Bottom View