source(variable resolution)->VE811T->VP1421->TV wall

If I want to use the scaler function of VP1421 to fix the output resolution to 4K, is there any limitation or something I need to be careful?

The scaler function has limitation below:

1. Only Display A could upscale to 4K resolution.  The scaler function of Display B is downscale to 1080p.

2. The refresh rate couldn't scale from 30Hz to 60Hz or from 60Hz to 30Hz.  It could only upscale or downscale from 60Hz to 60Hz.