Attached and linked are several files supporting the development of systems using the ADV7181C.
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There is no SXGA set up script in this script file.
Do you still have old script file ADV7181C_ADV7181C@_ADV7341-VER.3.0.txt, which has the SXGA setup?
Can you post it?
Table 8 in the Manual does not list SXGA resolution. The data sheet only talks about resolutions up to 1024x768@70Hz (XGA70). You might try the XGA script and see if it locks on to SXGA since the pixel clocks are about the same. No guarantee.
The ADV7842 will work for SXGA resolution.