DS90UB962-Q1: Occasional Lock fail issue

Ryan Wang

Part Number: DS90UB962-Q1
Other Parts Discussed in Thread: ALP

Dear expert,

My system is UB962<->UB935. There are four working UB962 board(not TI EVM) in my lab. Three works fine. One UB962 has 20% chance fail to lock with UB935 even after 1500ms waiting time. All 4 port of this "bad" UB962 can reduplicate the issue. After re_soldering this "bad" UB963 to a new board, the phenomenon go with this "bad" UB963.

UB962 register for AEQ from 0xD2 to 0xD5 are in default value.

I think silicon failure shouldn't be in so high ratio. Any recommendation you can give me to investigate?

Margin Analysis of BAD UB962

Margin Analysis of GOOD UB962

over 4 years ago

0 Ryan Wang over 4 years ago

TI__Expert 7700 points

BTW, when I try to change AEQ setting with TI EVM, the change doesn't take effect in ALP. Do these register need some condition to modify?

0 Nicholas Darash over 4 years ago in reply to Ryan Wang

TI__Mastermind 18755 points

Hello,

The MAP tool in ALP will try all settings so it shouldn't matter what settings you set prior to running the tests? Also can you modify the dwell time to match so we get a consistent result between the two boards? Try a longer dwell time as well for more robust results.

Regards,

Nick

0 Ryan Wang over 4 years ago in reply to Nicholas Darash

TI__Expert 7700 points

Nicholas,

I don't mean try setting for margin analysis. I want to try AEQ setting for customer board to find some clue. But ALP doesn't allow me change 0xD2 to 0xD5 register.

OK. I will try margin analysis with 5000ms dwell time.

0 Nicholas Darash over 4 years ago in reply to Ryan Wang

TI__Mastermind 18755 points

Hello Ryan,

Why can't you overwrite the registers? The output of the MAP script should give you AEQ register settings to write.

Also I think 5000ms is good. Make sure you change good and bad.

Regards,

Nick

0 Ryan Wang over 4 years ago in reply to Nicholas Darash

TI__Expert 7700 points

Nicholas,

Thanks for feedback.

I will close this item first. When I finish MAP, I will get back to you with new item.

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DS90UB962-Q1: Occasional Lock fail issue