ARM Technical Support Knowledge Articles

CHAINING JTAG DEVICES

Applies to: ULINK USB-JTAG Debugger

Answer


Information in this article applies to:


QUESTION

I have used ULINK on a evaluation board with no problems. Now I have got the real hardware where there is an FPGA(EP1K30) in the JTAG chain. It does not work. What is required to allow chained devices on the JTAG bus?

ANSWER

ULINK supports device chaining on the JTAG bus. But a JTAG device must have the following attributes to allow chaining:

If the automatic setup does not work, you may manually setup the attributes of the device. In this case only BYPASS register must be implemented for chaining.

MORE INFORMATION

Article last edited on: 2007-01-28 19:21:53

Rate this article

[Bad]
|
|
[Good]
Disagree? Move your mouse over the bar and click

Did you find this article helpful? Yes No

How can we improve this article?

Link to this article
Copyright © 2011 ARM Limited. All rights reserved. External (Open), Non-Confidential