Can the ADV7393 accept square pixel mode data (640x480 for NTSC)?
Yes, ADV7393 will accept square pixel mode (640x480 for NTSC). The clock input needed will be now 24.54MHz (for NTSC).
Square Pixel Mode can be enabled by register 0x82. Note that for CVBS and S-Video (Y-C) outputs, the SD subcarrier frequency registers must be updated to reflect the input clock frequency used in SD square pixel mode. Also note that the SD input standard auto detection feature must be disabled in SD square pixel mode (this is disabled by default after reset)
Example scripts are provided within the datasheet, on the configuration scripts section
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