Device is not detected in JTAG chain..Possible Reasons...???????

Hi!
we have a Custom BF532 Board, which is working properly.......Newly we have soldered a new board of same PCB , the Board is not detected by ICE....

ICE test is failing at step 4 "Determining Scan Path Length" Telling No devices Detected in the chain......

I don't have much Idea abt JTAG.....I didn't understand How to debug it...This PCB is already working properly.......

Generally what are the things we need to check when Board is not detected by ICE.... Start a New Thread

the most general things are good ground and signal path. I had a lot of
problems with long cables and jtag lines run randomly over a board. Get
your header as close to the part as possible and run the lines with a good
ground plane and good contact between ICE and test board ground.

Try slowing down the jtag if possible, that might help too.

Patience, persistence, truth,
Dr. mike

On Sat, 18 Apr 2009, m...@yahoo.co.in wrote:

> Hi!
> we have a Custom BF532 Board, which is working properly.......Newly we have soldered a new board of same PCB , the Board is not detected by ICE....
>
> ICE test is failing at step 4 "Determining Scan Path Length" Telling No devices Detected in the chain......
>
> I don't have much Idea abt JTAG.....I didn't understand How to debug it...This PCB is already working properly.......
>
> Generally what are the things we need to check when Board is not detected by ICE....
> Start a New Thread

On Tue, 21 Apr 2009, Willer Justinvil wrote:

> Hi all,
>
> I was told that I can't use a PLL based clock with HP PCI ICE. Would
>anyone give more info on PLL or Phase Locked loop. I am assuming because
>HP PCI ICE does generate a continuous signals

I would guess it depends on how stable everything is. If it is slow
enough, it should not be a problem if the PLL has reasonable (i.e. +/- 1%)
stability. But I don't know - I've never had to do it that way.

Patience, persistence, truth,
Dr. mike Start a New Thread

Hello!! The issue is exactly because you're using a PLL-based clock source with the JTAG ICE. The problem is that the ICE doesn't use a continuous clock (as you had mentioned in this thread); using a PLL-based clock incurs too much delay for the PLL to lock. I think that this is mentioned in the latest version of EE-68, the JTAG appnote on www.analog.com.

Hope that this helps!!

Hi!
>we have a Custom BF532 Board, which is working properly.......Newly we have soldered a new board of same PCB , the Board is not detected by ICE....
>
>ICE test is failing at step 4 "Determining Scan Path Length" Telling No devices Detected in the chain......
>
>I don't have much Idea abt JTAG.....I didn't understand How to debug it...This PCB is already working properly.......
>
>Generally what are the things we need to check when Board is not detected by ICE.... Start a New Thread