Ethernut 3.0 Rev-E
This board was replaced by Ethernut 3.1 Rev-D in October 2009.
Ethernut 3.0 Rev-E 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.
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.
An introduction to the realtime clock and calendar chip used on Ethernut 3.
Changes Compared to Version 3.0 Rev-D
Revision E fixes known bugs of it predecessor revision D and provides minor enhancements:
- RoHS conformant version.
- Lead free Taimag RJLD-043TC RJ45 with integrated magnetics replaces the leaded Falco LJ1003.
- Double layer capacitor increased from 0.33F to 0.47F.
- CPU clock fed from CLKB output of the PLL. This enables glitch free dynamic clock switching.
- Additional open drain drivers to the IOWAIT outputs of the CPLD and the DM9000E.
- X1286 with 32k EEPROM replaces the X1226, which had 512 Bytes EEPROM only.
- Pin 60 of IC2 (DM9000E) connected to pin 61. Now the link LED is lit at 10 and 100 MBit connections.
- Pin 4 of IC8 (LT1616) connected to pin 5.
- Yellow LED for the link indicator, and green LED for activity. This conforms to Ethernut 1 and 2.
- An additional pull-down had been added to force the Ethernet Controller into 16-bit mode after power-up.
The WP pin of the MMC socket had been routed to the wrong pad (CH2). Thus, it is not possible to determine, if the write protection of an SD Card had been enabled or disabled. Furthermore, when inserting cards with write protection enabled, shield and digital ground will be shortcut. There is no easy way to fix this.
It has been reported that the board fails when inserting SD Cards with 2 GB or larger capacity. A glitch of a few nanoseconds had been observed on the 3.3V power line. Adding a 10uF capacitor in parallel to C5 (470nF) seems to solve the problem.