DLPC3433: vertical blanking signal behavior

JasonT

Part Number: DLPC3433

Tool/software:

I have the following image of DLPC3433 operation from TI which states that the data lanes enter LP11 state once per frame (which indicates vertical blanking). In the waveform, the data lane signals appear to be switching during the vertical blanking period (not always in LP11 state). What exactly are they doing - are vertical and/or horizontal sync packets being received during this part of the frame, with LP11 state separating the sync packets? Or is the switching just scope noise and the signals do actually remain in LP11 state during this part of the frame? Thank you -Jason

9 months ago

0 Alexander Chan 9 months ago

TI__Genius 9490 points

Hello Jason,

Welcome back to the E2E forums and we hope to assist you with your question.

What document are you referring to with the attached picture of the waveforms?

Regards,

Alex Chan

0 JasonT 9 months ago in reply to Alexander Chan

Intellectual 270 points

Hello Alexander Chan, the document is DSI Setup and Debugging Guide v1.0 which can be accessed here:

/cfs-file/__key/communityserver-discussions-components-files/94/0523.dsi-setup-and-debugging-guide-v1.0.pdf

Regards,

Jason

0 Maximus Rusi 9 months ago in reply to JasonT

TI__Expert 6715 points

Hi Jason,

Please allow us till the end of the week to get back to you. We will get updated scope shots to share with you and better answer your question.

Best,

Maximus

+1 Maximus Rusi 9 months ago in reply to Maximus Rusi

TI__Expert 6715 points

Hi Lucas,

After speaking with my colleagues we have come to the following conclusion. Our DLPC3433 supports a subset of DSI and the LP11 for Vertical syncs is a known limitation, so while you are correct in other systems there may be specific packets sent here, our DLPC requires it to be in LP11 mode for highest reliability. We are not experts on DSI front ends, however in our experience most DSI front ends allow the configuration of Vsyncs to be done in LP11 mode. We are unable to provide specific details of how the DSI functions as it is intellectual property which we do not own or have the rights to share. To better help your application, we recommend using a DSI signal generator to send video to the DLPC with the recommended settings shown in the guide I previously shared so that you may replicate this behavior.

Best,

Maximus

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DLPC3433: vertical blanking signal behavior