XC3000 non-recoverable lockup problem

lecroy7200 · 2005-03-11T15:57:20+00:00

I am looking at a design that was done several years back which usesseveral XC3000 devices. All devices are programmed with the same corefrom a computer on power up. What I am seeing is that once or twice ayear, one of the devices will enter a non-recoverable mode. In thismode, the device appears to be in power down or reset. Once in thismode I am no longer able to program the device. Pulling the XC3000'sreset low for 10us has no effect. The problem appears random. Theonly way to reprogram the part is to power down the IC. I have triedrunning tests where I just reprogram the device, over heat the device,change the supply voltages, etc. and can't reproduce the problem. Whenthe Xilinx device is in this mode, it draws little power. It can beheld in this mode for what appears an infinite amount of time andcauses no damage to the device.Was there some kind of an undocumented test mode built into the XC3000that I may be seeing? Does anyone else ever remember seeing a problemlike this?

Mar 11, 2005 84 Replies

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lecroy7200 21 years ago

You are correct!

Now that your posting again, why did you feel the need to change the subject line?

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Austin Lesea 21 years ago

See the subject line.

And, I have been posting, just not on your last thread, as I had nothing more to say.

Austin

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Jim Granville 21 years ago

.. and one hopes that this charge pump is only on, during programming. Otherwise it is turned off.

-jg

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Austin Lesea 21 years ago

Jim,

True. Charge pump in the CPLD is only needed for programming voltages of the EEPROM cells.

Austin

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lecroy7200 21 years ago

nothing

I did not expect to see any more posts from Xilinx after your last comments:

"Abuse is not going to make me likely to post further. As of this moment, the case is closed. We have done what we can with what you are willing to do (look under the streetlamp)."

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