TMS320F28377D: Run Time Errors After Change in Wafer Fab Code

Lance Hummel

Part Number: TMS320F28377D
Other Parts Discussed in Thread: UNIFLASH

Hi all,

I have a design that is in production that uses the TMS320F28377D, and the contract manufacturer that is assembling the PCA has noted that after a change in the wafer fab code on the parts they've purchased, that errors are popping up during the diagnostics that were put in place. The parts that had been used had wafer fab code and silicon revision YFC, while the new components that are having problems have the code $4C. The PCA itself is unchanged, and they have even replaced the uC on the same PCA with the different fab code and it works without generating errors. One error in particular is that a FW revision number that is generated at compile time and is stored in the FW image is now un-readable. The microcontroller is functioning so it's not a total failure, but it appears that the code is unable to read a particular chunk of the FLASH memory. So far this has been observed with 6 separate uC with the same fab code. Any help that could be provided would be greatly appreciated.

Best regards,

Lance Hummel

over 4 years ago

+1 MatthewPate over 4 years ago

TI__Guru* 80640 points

Lance,

Thanks for reaching out to the E2E. I believe what you are seeing is related to the PCN issued for this device and covered in this FAQ post. Let us know if this resolves your issue.

https://e2e.ti.com/support/microcontrollers/c2000/f/c2000-microcontrollers-forum/729543/faq-product-change-notice-pcn-20180523001-1-for-tms320f2837x-and-tms320f2807x-devices

Best,
Matthew

0 Lance Hummel over 4 years ago in reply to MatthewPate

Intellectual 960 points

Hi Matthew,

I'm working with the CM to verify the fix. I also found a software glitch related to the PCN. At one point I used a pointer to read the PARTID to validate the code was loaded into the expected uC. I didn't account for the upper 8-MSBs to possibly vary with the Flash memory implementation. Once I hear back from the CM, I will verify whether or not the problem has been resolved.

Best regards,

Lance

+1 MatthewPate over 4 years ago in reply to Lance Hummel

TI__Guru* 80640 points

Thanks Lance, will look for your next update.

Best,

Matthew

0 Lance Hummel over 4 years ago in reply to MatthewPate

Intellectual 960 points

Hi Matthew,

Using the newer revision of UniFlash and fixing the bug in the code managed to resolve all of the issues. Thanks for the timely response.

Best regards,

Lance

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TMS320F28377D: Run Time Errors After Change in Wafer Fab Code