Phil,
The FIFO does sound expensive,
here's another approach:

If you can get large enough "bucket brigade" charge coupled delay lines,
then using two per colour (six) you can simultanously scan one original
frame on three CCD chips, meanwhile, the other three CCD chips are
sequentially offloading their image at triple speed to the monochrome
input. OBTW, I presume all this trouble is due to strobed RGB
backlighting ? (It's always seemed a waste to me to have diferent pixels
for the RGB components)

I don't know about the time factor, but bosses have to have goals,
realistic or not.

regards,
Graham Daniel

Philibert Perusse wrote:
> 
> Suppose this problem. You have to take an VGA 640x480 RGB signal where on
> each color is mapped an grayscale image so we have
> three differents images comings at 60Hz...What you have to do with this VGA
> signal is to show it at 180Hz on a particular monochrome LCD display. You
> have to show the three monochrome images that composed the VGA signal one
> after the other. So lets look at
> a solution of this problem.
> 
>  I think that you must digitalize (GRAB) the 3 colors independently and
> store them before to take them to the LCD one color frame at the time. So,
> this problem is almost the same than to make a frame grabber that grab a VGA
> signal and store it into any kind of memory (I do prefer to use FIFOs).
> Moreover, the complete design must take place over a single 5"x4" board.
> It's my solution but is someone has a better idea!!!!
> 
> So, here is MY problem. Is-it realistic to do this in 10 weeks (15 hours a
> week) with a total cost (for each unit, not considering the development) of
> maximum 500$ by unit?
> 
> I think not! (Considering that Cypress 128k FIFOs cost 150$ each) But I hope
> I'm not wrong because I'll try to explain that to my boss!!!
> 
> (You've probably remark my poor english...is't because I'am a french
> canadian!!!!)
> 
>                     Phil!
> Philibert Pˇrusse <perusse@ino.qc.ca>
> INO
> 369, rue Franquet
> Sainte-Foy, ( Quˇbec) Canada  G1P 4N8
> tel: (418) 657-7006 Fax: (418) 657-7009
> http:// www.ino.qc.ca