the HDMI to RGB converter device ADV7611BSWZ can support the custom resolution. Aspect ratio of 1:1 411x411, 512x512, aspect ratio of 4:3 411x575, 512x575
165 MHZ is maximum TMDS clock frequency for ADV7611.What is Pixel clock of the customized resolutions? If it is under this limit, then ADV7611 would handle this format.
Sorry we have not tested these formats. If you have evaluation platform then you can try these formats.
Please refer ADV7611 Design Support Files and go to the desired design support files and you can refer the documentation like data sheet, hardware manual to know more about this part.
We would recommend that you can start with a standard script available at design support files
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