DS90UB941AS-Q1 how to set registers to support hs/vs mode？

user6350583

Hi Expert，

i am use a design like descript at link below, colorbar test is work well with internel clock or externel clock.

https://e2e.ti.com/support/interface/f/138/t/934635?tisearch=e2e-sitesearch&keymatch=DS90UB941AS-Q1

my isuue is :mipi dsi clock is 162Mhz 0x5f=0x36, our lcd is use hs/vs mode,clock need set at 140Mhz,how can i resolve it?

over 5 years ago

0 Michael.Walker over 5 years ago

TI__Mastermind 19720 points

Hi,

What do you mean by your "hs/vs mode,clock need set at 140Mhz" is the pixel clock at 140MHz? What DSI mode is your source? Non-Burst Mode with Sync Pulses, Non-Burst Mode with Sync Events, Burst Mode?

Regards,

Michael W.

0 user6350583 over 5 years ago in reply to Michael.Walker

Prodigy 30 points

Hi Michael ，

1. DSI mode used is Non-Burst Mode with Sync Events. Use hs/vs mode pixel clock need to set at 140Mhz .I have test it in color bar test.

In Pattern Generator Indirect Registers, set PGCDC1 0x03 =0x39 PGCDC1 0x1a=0x0a, set other registers folow link:

e2echina.ti.com/.../ti-fpd-link-iii
I can get perfect colorbar sence,and 0x5f =0x8c. And DS90UB948 with pannel is work well with serial device Ds90UB947 at 140Mhz.

2. we have test panel before, 162Mhz is proved right at DE mode.

0 Michael.Walker over 5 years ago in reply to user6350583

TI__Mastermind 19720 points

Hi,

The serializer must be programmed to generate the desired sync widths with the DSI_HSW_CFG and DSI_VSW_CFG registers in mode. Are you programming these registers with the proper parameters?

Regards,

Michael W.

0 user6350583 over 5 years ago in reply to Michael.Walker

Prodigy 30 points

Hi Michael ，

How to set DS90UB941AS register to support open LDI？

0 Michael.Walker over 5 years ago in reply to user6350583

TI__Mastermind 19720 points

Hi,

You do not need to program the 941AS to support OpenLDI. All you need to do is plug in a compatible FPD-Link to OpenLDI Deserializer.

Regards,

Michael W.

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DS90UB941AS-Q1 how to set registers to support hs/vs mode？