Discovering 2Wire card edge pinout (for JTAG / I2C)

PCIe extender cable and Sullins GCE08DHRN dual row card edge connector

Ribbon cable split off and card edge connecter soldered into place to form JTAG cable

JTAG cable fitted to a 2Wire PCB

Trial and Error..

BINGO! JTAG pinout established

Pinout for 2Wire dual row card edge connector (found on models 1800, 2071A, 2700, 3600, 3800, 3801)

The pinout of the card edge connector was found to be the same in all models of 2Wire router.

The only oddity is the 2071A, a 2Wire model sold exclusively in Australia.   The 2071 connector is upside-down (like Australia herself!)

The following JTAG device IDCODEs were discovered for the Medusa, Perseus, Ares and the dual core Denali:

$ sudo jtag

UrJTAG 0.10 #2017
Copyright (C) 2002, 2003 ETC s.r.o.
Copyright (C) 2007, 2008, 2009 Kolja Waschk and the respective authors

UrJTAG is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
There is absolutely no warranty for UrJTAG.

warning: UrJTAG may damage your hardware!
Type "quit" to exit, "help" for help.

jtag> cable usbblaster
Connected to libftdi driver.

jtag> detect

IR length: 5
Chain length: 1
Device Id: 00010010011010011011010011000001 (0x1269B4C1)
 Manufacturer: 2Wire (0x4C1)
  Part(0):      TM3260 (0x269B)
  Stepping:     Medusa
  Filename:     /usr/local/share/urjtag/2wire/tm3260/tm3260

jtag> detect

IR length: 5
Chain length: 1
Device Id: 00100010011010011011010011000001 (0x2269B4C1)
  Manufacturer: 2Wire (0x4C1)
  Part(0):      TM3260 (0x269B)
  Stepping:     Perseus
  Filename:     /usr/local/share/urjtag/2wire/tm3260/tm3260

jtag> detect

IR length: 5
Chain length: 1
Device Id: 00110010011010011011010011000001 (0x3269B4C1)
  Manufacturer: 2Wire (0x4C1)
  Part(0):      TM3260 (0x269B)
  Stepping:     Ares
  Filename:     /usr/local/share/urjtag/2wire/tm3260/tm3260

jtag> detect

IR length: 5
Chain length: 1
Device Id: 00010010011010101100010011000001 (0x126AC4C1)
  Manufacturer: 2Wire (0x4C1)
  Part(0):      Denali (0x26AC)
  Stepping:     bcm6091
  Filename:     /usr/local/share/urjtag/2wire/denali/denali

jtag>

We can use these discoveries with the JTAG software we developed earlier for the TriMedia-based 2Wires. [1]

[1] http://hackingbtbusinesshub.wordpress.com/2011/12/19/open-source-trimedia-jtag-tools/

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