Add Jtag Port

From NAS-Central Buffalo - The Linkstation Wiki

This document is a work in progress. It explains how to fit the internal on-chip debug (OCD) port on a Linkstation, Kuro-Box or Kuro-Box/HG to a PC interface.

Cable required:

OCD connector

The internal OCD port uses an electrical standard known as JTAG/COP. The signals have to be buffered to protect the hardware from damage and we use a JTAG wiggler to do this.

Those with some electrical experience could build their own circuit, but most will opt for ordering one.

Schematics and Software to build your own

http://hri.sourceforge.net/tools/

Buy one

--- Commercial --- The Wiggler seems to be the cheapest at $150.

__Hobby__ Could the 20-pin ARM-JTAG be modified to work with Kuro-Box? $20.

-=Locate the pads=- The pads are labelled CN5: [1]

-=Connector Pin-outs=- In order to use this port, you should add the 10K series VIO resistor R67 and a 4-way 1K resistor pack at RA11. It may be possible to use some functionality without these components.

If you know which set of pin-outs that LinkStation/Kuro-Box uses, please update this page with the details.

__PowerPC 4xx series JTAG as used by IBM__ {img src=http://www.kurobox.com/online/show_image.php?id=7 width= height= align= desc= link= }

__COP interface used by Motorola (PowerPC 6xx, 7xx, 8xx) and IBM PowerPC (6xx, 7xx)__ {img src=http://www.kurobox.com/online/show_image.php?id=8 width= height= align= desc= link= }