Parallel to DVI Bridge Chips
These two chips can be used to generate high resolution DVI signals.
TFP410 by Texas Instruments provides a bridge between a parallel single ended video interface and DVI/HDMI. It supports up to 24bit 1600x1200 pixels at 165Mhz. Input can be 12 bits wide DDR, or 24 bits wide SDR.
SIL164 by Lattice Semi also bridges RGB to DVI. Either TFP410 or SIL164 can be used in the 1BitSquared DVI output PMOD (€22) or the Adafruit DVI/HDI Decoder ($30).