antoinevg / hello-ethernet

hello-ethernet.git

Various experiments with a Waveshare LAN8720 breakout and a Latice ECP5.

Setup

Python Environment

# pyenv
curl https://pyenv.run | bash

# environment
pyenv install 3.11.1
pyenv virtualenv 3.11.1 flowdsp-amaranth
pyenv local flowdsp-amaranth
pip install --upgrade pip

# packages
(cd toolchain/amaranth.git && pip install .)
(cd toolchain/amaranth-boards.git && pip install .)

# enable yosys
source toolchain/oss-cad-suite/environment

Test Installation

python3 -m amaranth_boards.ulx3s 85F

Uninstall

pip uninstall -y -r <(pip freeze)

pyenv uninstall flowdsp-amaranth
pyenv uninstall 3.11.1

Connections

LAN8720

Pin	Function		Pin	Function
14	TXD1		13	n/c
12	TX_EN		11	TXD0
10	RXD0		09	RXD1
08	R_RXCLK		07	CRS_DV
06	MDIO		05	MDC
04	GND		03	GND
02	VCC		01	VCC

• Had to bodge nRST to pin 13.
• Not strictly a PMOD as it has one more pin for TXD1.

ULX3S

Use the conenctor next to the SDCARD

Pin	Function		Pin	Function
GN9	TXD1		GP9	n/c
GN10	TX_EN		GP10	TXD0
GN11	RXD0		GP11	RXD1
GN12	R_RXCLK		GP12	CRS_DV
GN13	MDIO		GP13	MDC
GND	GND		GND	GND
VCC	VCC		VCC	VCC