Add Jtag Port

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 Macraigor Wiggler seems to be the cheapest at $150.

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

Locate the pads

The pads are labelled CN5:

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.

According to Baulab the following pins are identified

TDO	1		2	?
TDI	3		4	?
?	5		6	?
TCK	7		8	?
TMS	9		10	?
TMS	11		12	?
Vcc	13		14	?
?	15		16	Gnd

The same page also contains the schematics, some pictures of the jtag cable and software needed. This cable can be used without adding the additional components.