Commit 1121910a authored by MarBle's avatar MarBle
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* The access to computer and everything, that can show you how the world works shall be unlimited and complete.
* All information must be free.
* Mistrust authorities - foster decentralization
* Judge a hacker for what she/he does and not according to usual criteria such as visual nature, age, ethnic group, gender or social position.
* You can create art and beauty with a computer.
* Computers can change your life for the better.
* Do not mess with other peoples data.
* Use public data, protect private data.
The MIT License (MIT)
Copyright (c) 2016 c3dprk
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
# FL2K Liberation
This projects goal is to reverse engineer the PCB and schematic of the USB3.0
to VGA dongles used in [osmo-fl2k](https://osmocom.org/projects/osmo-fl2k/wiki).
This project doesn't claim to be complete or correct.
## Power
The circuit has 8 different power rails. Two 5V rails and six 3.3V rails. The 5V
from the USB goes through a ferrite bead to two buffering caps and supplies a
linear and a switching regulator and through a diode the KEY/PWR pin on the VGA
connector.
The switching regulator supplies 3.3V - presumably for the digital domain of
the FL2000. The 3.3V are split into three different parts via ferrite beads to
block switching noise.
The linear regulator supplies 3.3V - presumably for the analog domain of the
FL2000. The 3.3V are split into three different parts via resistors (which are
soldered in place of ferrite beads).
## Clock
Connected to the FL2000 is a 10MHz quartz crystal. The driving side of the
FL2000 goes through a 22Ω resistor to the crystal. There are two load caps
connected to the crystal.
## I²C
The SCL and SDA pins of the VGA ports are connected to the FL2000 via two
[MOSFET level shifter](http://www.hobbytronics.co.uk/mosfet-voltage-level-converter)s,
translating between 5V and 3.3V. The pull-up resistor on the 5V side are not
populated.
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