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Synchronization signals for ADV7120 & ADV7125

Hi all,

I want to develop one VGA interface.

My input is 24-bit parallel RGB data, HSYNC & VSYNC.

My output is VGA (Analog RGB data, HSYNC & VSYNC) on a standard DE-15 VGA connector.

My question is:

If I use any of the 2 encoders (ADV7120 or ADV7125) to convert the digital RGB inputs to analog RGB outputs,

will there be any problem if I do not provide the sync signals (HSYNC & VSYNC) to any of these encoders & directly

pass the sync signals (HSYNC & VSYNC) to the VGA connector ??

Will such a system work??