UCD90320: Resetting device to factory default / unexpected random enabling of rails

Fabian Pfaeffli1

Part Number: UCD90320

Dear Forum

I have this strange behavior of the UCD90320, that DURING initial programming after shipping, the rails are enabled unexpectedly and in random order!!! This is absolutely shocking to me since the sequencer is used to orchestrate 28 rails that have very strict requirements for sequencing!!! I am not sure if the damaged FPGA (6000 US$!!!) we encountered lately is due to this erratic behavior!

Now I wanted to find out if I can make some sort of a "dummy"-Config that is first written to the device before programming the final configuration. This dummy-config can hopefully be defined in a way to prevent the device from going mental during programming of the final config. Since I don't have any devices that are in factory condition anymore, I'd like to reset one of the already programmed devices to factory defaults to develop the aforementioned dummy config. In your guide "Configuration Programming of UCD Devices" from 2010(!!!) on page 30 you describe this exact method by using the provided function "Clear Configuration" from the "Tools" tab. Unfortunately, this tab is no longer available in Fusion designer 7.1.1. How can this "factory reset" be done with the latest tools?

Maybe someone has a tip for me how to prevent the UCD90320 from randomly enabling the rails by applying another trick?

BTW: No, all enable inputs at the power converters we use are active high, so this can't be the reason for the observed behavior!

Regards

Fabian

Edit: Added text in bold font

over 6 years ago

0 yihe over 6 years ago

TI__Guru 65920 points

Hello

Do you mean the rails are enabled unexpectedly in the middle of programming or after programming successfully? How do you program the UCD90320? we recommend using data flash file as mentioned in the data sheet to ensure that all IOs are under controlled states.

When you open the FUsion GUI, does the sequencing chart shown in the GUI match your design?

The clear configuration function is not available for UCD90320 currently but we are working on this feature.

Regards

Yihe

0 Fabian Pfaeffli1 over 6 years ago in reply to yihe

Prodigy 180 points

Hi Yihe

Thanks for your Answer. The outputs are enabled DURING programming. Afterwards, everything is OK and according to expectations.

I usually do the programming with the Fusion GUI by importing the appropriate *.tifsp design. This is then automatically loaded into the Device and stored in the NVM. Is there a guide on how to correctly load the flash file into the device in order to keep the enables silent during programming?

Thanks and best regards

Fabian