ECP5 video output

We can use direct RGB connection from ECP5 to RGB LCD.

Downside of direct connection is that we will use a lot of pins.

On ULX3S direct connection would use complete RIGHT side of the board.

To save pins we can use TPF401 DigitalReceiver chip.

Texas TPF401

That would add costs, but will save a lot of pins, this chip is already tested with our HDMI out, and it is using 4 fake differential lines.

We still need to check if there is some replacement chip that can do same thing.

RTD2660 seams like possible replacement, but it is not widely available.