fpga/trashernet
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Trashernet is a very trashy Ethernet stack for FPGAs written in VHDL aiming to cover all OSI layers, including physical!
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VHDL 96.6%
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Markus Koch 38f96cdc63 phy: rx: Come up in disconnected state after reset
2021-08-28 14:25:51 +02:00
trashernet phy: rx: Come up in disconnected state after reset 2021-08-28 14:25:51 +02:00
README.MD Initial commit 2021-08-27 20:10:47 +02:00

README.MD

Trashernet

Trashernet is a very trashy Ethernet stack for FPGAs written in VHDL aiming to cover all OSI layers:

  • Layer 1, Physical: trashernet_phy
  • Layer 2, Data link: trashernet_mac

When writing it, the following were the main design philosophies:

  1. Standards are nice and all, but this, it just needs to work.
  2. Hardware is expensive, LOC are not. So let's do everything we can inside the FPGA.
  3. If there's a feature that feels optional even though it isn't, it is. See 1. if in doubt.

IMPORTANT: This code (and HW suggestions) violate the Ethernet standard in many ways. Do not use in proper (especially commercial) products.

Hardware

TBD. TL;DR:

  • RX: Use resistors behind Ethernet magnetics to reduce Ethernet RX voltage levels (0 +-2.5V) to LVPECL voltage levels (1.65V +-400mV). Or LVDS if your FPGA can't handle LVPECL.
  • TX: Meh, a series current limiting resistor is good enough.

License

This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.