Ethernut 3.1 Rev-D
Ethernut 3.1 Rev-D Hardware User's Manual
including all schematics.
Ethernut 3 Memory Map
Ethernut 3 memory layout.
Ethernut 3 CPLD
A detailed description of the CPLD registers.
Eagle 4.11 schematic and board file.
How to create firmware binaries running on Ethernut 3.1 and 3.0.
Nut/OS on Ethernut 3
How to install Nut/OS with a cross compiler and try a few sample applications on Ethernut 3.
Introduction to Ethernut 3 JTAG programming. Additionally describes how to restore the TFTP Boot Loader.
OpenOCD and Ethernut 3
How to use OpenOCD with Ethernut 3 and Turtelizer 2.
Booting Ethernut 3
explains in detail how to get your Ethernut 3 application running after power-up.
How to upgrade the CPLD logic. It explains how to build and upload a new contents for the CPLD easily within seconds and without any special programming adapter.
An introduction to the programmable clock chip used on Ethernut 3.0 Rev-D and Rev-E.
Changes Compared to Version 3.0 Rev-E
Several parts had been replaced on board version 3.1:
IC2 DM9000(E) had been replaced by the new DM9000A. Advantages are:
- Smaller package
- Auto-MDIX support
- Wakeup pin not available in 16-bit mode
- Wait pin not available in 16-bit mode
- Incompatible LED function (link indicator with 100Mbit only)
- Auto-MDIX requires a different RJ-45 magnetics. We chose one with tab-up for better readability of the LEDs. However, this type is slightly larger and may not work with existing add-on boards.
- IC7 X1286A8 (Intersil) is no longer recommended for new designs and had been replaced by the PCF8563T (NXP). The bad news is, that the replacement comes without EEPROM.
- Logic gates IC11 and IC12 74LVC1G00GW had been replaced by a single 74AUP2G04GW as IC11. However, IC12 had been re-used as a chip select inverter for IC2 to maintain backward compatibility.
- The 1A fuse had been replaced by a 0.5A type.
- LED resistors had been reduced from 180Ω to 120Ω.
The following parts had been added:
- An AT45DB321D-SU serial DataFlash had been added. The WAKEUP signal is no longer available and the related pin is used here as a chip select.
- A common mode choke had been added to the power supply input to reduce EMI.
- New 15pF capacitors C53..C56 had been added to the Ethernet lines to reduce EMI.
- Pads had been added for a serial EEPROM, which may be used for Ethernet Controller boot configuration. However, no parted will be mounted by default.
The following parts had been removed:
- Open drain driver IC13 is no longer required, because the new Ethernet Controller does not provides any NWAIT signal.
- R28 had been removed, because the related output at IC10 is not connected.
Finally all known bugs of the predecessor 3.0 Rev-E had been fixed:
- The MMC write protect switch is now routed to the correct pin.
- Ceramic capacitor C5, 470nF, had been replaced by a 10uF tantalum to provide better supply stability while inserting an SD-Card.
Due to a missing pull-up resistor, the FBUSY line of the NOR Flash is not functioning. Alternative methods like the toggle bit algorithm or data polling must be used.