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DS90UB934-Q1: how to optimize the pclk from imx6

Amelie Zheng
Genius 10865 points
Part Number: DS90UB934-Q1

Hi team,

My customer now use 913 and 934 in their 360 surrounding  view system.

The signal chain is iMX6 → 913 →934→head unit.

The display in head unit is always flick and also LOCK is flick.

I already ask customer to check whether PCLK is ok in 934. They said that 934 PCLK come from iMX6. 

Customer now test 934 PCLK output as the scope, it is 72MHz. The scope use full band width. The jitter need to lower than 0.4UI= 1/72M*0.4=4.2ns.

In the video, the jitter haven't been higher than 4.2ns. So the PCLK seems to be ok?

Do you have any advice about the display flicker?

As customer feedback, when they use  iMX6 → 913 →954→head unit,  it could display normally. So customer also doubt whether 934 has some problem with 913?

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/webwxgetvideo.7z

  • 0
    TI__Mastermind 30515 points

    since the LOCK pin in 934 side is toggling when the panel has flicker, you should focus on 913a and 934 link NOT on 934's PCLK output, the 934 PCLK output doesn't impact 934's LOCK pin.

    here, pls check:

    1. iMX6's PCLK output to 913a, pls check if the jitter can meet 913a's input request in d/s?

    2. checking the PoC network, including sch., layout and component parameter (following up d/s or evm design) does it meet TI's recommendation? and how about connector / cable?

    regards,

    Steven