TDA2HG: how to adjust the vsync&hsync to meet the timing of ub933/ub964

user5312037

Genius 4320 points

Part Number: TDA2HG

Hi:

we are using dpi1 output to ub933 connected ub964 to generate csi2 frame data

Question:

how to configure the vsync&hsync to meet the ub964 timing that hsync should at least tail vsync 5 pclk

here is what we see out lcd1 vsync&hsync

here is camera's vsync&hsync

pVInfo->mInfo.pixelClock = 74500U;
    pVInfo->mInfo.fps = 60U;
    pVInfo->mInfo.hBackPorch = 20U;//20U80
    pVInfo->mInfo.hSyncLen = 62U;
    pVInfo->mInfo.hFrontPorch = 20U;//20U48
    pVInfo->mInfo.vBackPorch = 12U;
    pVInfo->mInfo.vSyncLen = 35U;
    pVInfo->mInfo.vFrontPorch = 6U;
    pVInfo->vencDivisorInfo.divisorLCD = 1;
    pVInfo->vencDivisorInfo.divisorPCD = 1;

change above parameter can not delay the vsync&hsync.

any help? Thanks......

over 5 years ago

0 Brijesh Jadav over 5 years ago

TI__Guru**** 438775 points

You mean to delay LV by few clock cycles with respect to FV?

Rgds,

Brijesh

0 user5312037 over 5 years ago in reply to Brijesh Jadav

Genius 4320 points

Hi Brijesh：

You're right, else the UB964 CSI2 output incorrect data. till now we can't find any document to introduce delay hsync after vsync

0 user5312037 over 5 years ago in reply to Brijesh Jadav

Genius 4320 points

Brijesh:

For now, we connect the tda2hg'DE signal to UB933's Hsync, then we can get full screen, but it not meet the custom requirement.

0 Brijesh Jadav over 5 years ago in reply to user5312037

TI__Guru**** 438775 points

Hi,

I am sorry, could you please help me understand why it is not acceptable? why is it not meeting customer requirement?

Rgds,

Brijesh

0 user5312037 over 5 years ago in reply to Brijesh Jadav

Genius 4320 points

Hello Brijesh:

custom want us to adjust time delay between the hsync and vsync, as stated above, the hsync and vsync always come up simultaneously.

0 Brijesh Jadav over 5 years ago in reply to user5312037

TI__Guru**** 438775 points

Hello,

Unfortunately, as far as i know, DSS outputs hsync and vsync aligned.. You could probably put some delay flip-flops to delay hsync/vsync by few cycles, if that is required.

Rgds,

Brijesh

Processors

Processors forum

TDA2HG: how to adjust the vsync&hsync to meet the timing of ub933/ub964

Question:

here is what we see out lcd1 vsync&hsync

here is camera's vsync&hsync