Question about BEN-VGA, it's that possible that VGA-->BEN? Ben nanonote as a monitor?

Werner Almesberger werner at almesberger.net
Thu May 5 09:59:24 EDT 2011


Xiangfu Liu wrote:
> it's that possible that Ben read the VGA signal? 
> then display it in a small 320x240 screen?

Interesting idea :-) You could trigger on a hsync/vsync easily
enough, probably with enough accuracy to get the pixel timing
more or less right at 320x240.

For reading the R/G/B signals, you would need some kind of
fast ADC, though.

Assuming VGA timing, your pixel clock at 320x240 with line
doubling would be around 12.5 MHz. The ADC in the Ben can
only do up to 187.5 kSa/s (the 4760 would be able to do 1
MSa/s)

A chip like this one ought to be able to do the job, though:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=ADC1173CIMTC-ND

A simpler solution may be to use comparators (after all, you
only need 1-2 bits per channel). This one may do the trick:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=LMV7239M5CT-ND
(There may be less expensive choices.)

- Werner




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