DS90UB941AS-Q1: DS90UB941AS-Q1: asymmetric splitting

max

Part Number: DS90UB941AS-Q1

In the application notes document of DS90UB941AS-Q1, it is mentioned that in case of asymmetric splitting, resultant image will be produced at the half of the frequency of the superframe image. Is it meant to be that if we are producing superframe at 60Hz, DS90 will produced images for downstream display at 30Hz? If answer is yes how can 60Hz can be achieved for both displays?

over 5 years ago

0 Casey McCrea over 5 years ago

TI__Guru** 103215 points

Hello DD,

There are multiple clicking modes available but the section you are referencing is for PCLK from DSI clock. So whatever PCLK you use for the superframe image, it will be cut in half for each output image. So you must select the DSI/PCLK appropriately so that each resulting screen gets the desired PCLK for 60Hz. Let’s say for example that you have two screens each with PCLK = 75MHz, then for your superframe image you would use 150MHz.

Best Regards,

Casey

0 max over 5 years ago in reply to Casey McCrea

Intellectual 595 points

Hi Casey,

Thanks for the clarification. What would be the impact of raising PCLK in DSI? For example, it will generate double vsync interrupts? Is there anything else I should consider?

0 Casey McCrea over 5 years ago in reply to max

TI__Guru** 103215 points

Hello DD,

For the superframe splitting, all horizontal parameters like HSYNC, HBACK, etc. will be split by 1/2 for each output image and the vertical parameters will be the same. You can find more information about asymmetric splitting here: http://www.ti.com/lit/an/snla308/snla308.pdf

Best Regards,

Casey

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DS90UB941AS-Q1: DS90UB941AS-Q1: asymmetric splitting