DS90UB947-Q1: DS90UB947-Q1 LVDS Panel setting & mode SEL match

Hi Nikolas,

I need to know which options are selected in the screenshot of the monitor itself and which parameters of the 947 I2C register need to be modified along with the monitor options.

Best Regards

Johnny

Hi Johnny,

I would recommend aligning with the SoC provider first. TI does not support the monitor, so we are unable to give you recommendations based on the monitor itself.

With regards to the 947 I2C register, are you asking how to configure the relevant device's registers for initialization? If so, I would need more information regarding what you are attempting to accomplish. Are you currently attempting PATGEN or to bring up end-to-end video? Could you please send me a block diagram and what modes you intend for your device to be strapped?

Best,

Nikolas

Hi Nikolas,

Because the client DS90UB928 settings are fixed, I need to adjust the scratchpad and mode selection parameters of our DS90UB947. We don't know how to set the LVDS parameters to make the DS90UB947 match the DS90UB928. Can you help tell us how to set it up?

Please refer the attached file for pdf

FPD LINK.pdf.

Hello Johnny,

The mode selection parameters of the 947 will automatically align with the 928, so it is not required for the user to manually match them between the two devices. With that in mind, please provide me with both the incoming timing (from "LVDS" block) and the timings of the output display. Once I have that information, I can continue to assist you on this matter.

Best,

Nikolas

We tried to use 949 to connect to 928. The screen can be displayed now, but there is a problem with the RGB screen (such as the attachment). Do you need to modify anything? The hardware design is in the previously provided pdf.

Hi Johnny,

When you connected the 947 to the 928, was the screen displayed correctly? Was PATGEN attempted with either the 947->928 or the 949->928 configuration?

Best,

Nikolas

Hi Nikolas,

Give me a few days to try 947 to connect to 928, but the LVDS mode SEL settings and I2C register parameter settings can only use the 947 default values. I will get back to you if there is any situation. Thanks

Best Regards

Johnny

Hi Johnny,

Okay, please let me know once you have any updates regarding the 947 setup.

In the meantime, would you be able to provide me with both the display's datasheet and its timings?

Best,

Nikolas

Hi Nikolas,

947 can be displayed normally. Currently there are only 949 display screens with color difference issues. Do you need to adjust the 949 register parameters?

Best Regards

Johnny

Johnny,

Due to the US public holiday the team is currently out of office and will resume operations on Tuesday. Thank you for your patience at this time 

Best Regards,

Casey 

Johnny,

This looks like a MAPSEL issue to me. All you should need to do is to flip the MAPSEL setting on 928 since 949 only has one possible color map setting.

Try setting 928 register 0x49 = 0x40 or 0x60 and you should be able to resolve the color issue with one of those settings

Best Regards,

Casey 

Hi Casey,
Ok I will try and tell you the results later.
Best Regards,

Johnny