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Dangerous Prototypes

Dangerous Prototypes => Bus Blaster JTAG debugger => Topic started by: Wil on May 08, 2012, 01:49:13 pm

Title: [SOLVED] TDO stuck
Post by: Wil on May 08, 2012, 01:49:13 pm
Hi,

I ordered my BusBlaster v2 almost a year ago from Seeed Studio.
From the beginning I had to struggle with the following messages with UrJTAG:

Code: [Select]
warning: TDO seems to be stuck at 0
or
Code: [Select]
warning: TDO seems to be stuck at 1

And sometimes, for no reason, and without changing anything to the wiring, it simply worked.

Then I found why...
Here are some self-explanatory close-up shots of my BusBlaster, before I fixed it.

Pins at the top of the FT2232HL chip with almost no solder on them.
[attachment=2]

Pins at the bottom of the FT2232HL chip, misaligned but soldered.
[attachment=1]

Top view, misaligned chip on one axis.
[attachment=0]

I reflowed the FT2232HL with a hot-air rework station. Since then, my BusBlaster works flawlessly.
I thought i was worth sharing.

Cheers,
Wil
Title: Re: [SOLVED] TDO stuck
Post by: ian on May 08, 2012, 04:13:41 pm
Hi Will,

I'm sorry about the defect in the Bus Blaster, thanks for the report. I'm glad you got it going, but if there is anything else I can do please let me know. I will definitely ask about loose pins in the future if anyone has this problem.
Title: Re: [SOLVED] TDO stuck
Post by: Wil on May 08, 2012, 05:13:46 pm
Hi ian,

One more info, I never had any problem accessing the onboard Coolrunner (xc2c32a-vq44).
This is probably a side effect of the "one axis" misalignment.

Wil
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