Hi,
I'm working on using Intel PXA255 to have simultaneous LCD panel & CRT display capability.
How do we convert the digital LCD signals to the analog RGB for CRT display. Namely from the PXA255 LCD controller outputs are:
L_FCLK : Frame clock L_BIAS : AC Bias / data enable L_LCLK : Line clock L_PCLK : Pixel clock L_DD[15:0] : pixel_data
There are dedicated EPSON graphics controller such as SD13860 that is abled for simultaneous LCD & CRT output, but cost is a factor, so i need to explore more ingenius methods.
how can the HSync, VSync, R, G, B signals be derived.
For the RGB signals, this is my concept on going about it. Suppose it is in 16-bit in 565 format.
RED -- (L_DD[15:11]) GREEN -- (LDD[10:5]) BLUE -- (L_DD[4:0])
- Use 8-bit (256-levels) to convert to its analog equivalent for the
3 signals. But who to synchronise with the HSync & VSync signals that are to be extracted from the digital clocks.
For HSync & VSync, how do we correlate with the Line Clock, Frame Clock & Pixel clock ?
SOme hints would be appreciated. Thanks All.
Regards,