video sync generator

[nyffeler]

For a special camera from Hamamatsu without internal sync generator I need to
build an external video sync generator with the folowing specs.

NON-Interlaced
horizontal sync: periode 64us (15.625 kHz) pulswitdh 6 - 8 us
vertical sync: periode 40- ms (25 Hz) pulswitdh 190 - 250 us

Does anyone have an idea how to build such a thing?

Peter

 

[Jan Panteltje]

On a sunny day (Fri, 30 Apr 2004 15:18:26 GMT) it happened
nyffeler@phys.chem.ethz.ch (nyffeler) wrote in <40926e41$1@pfaff2.ethz.ch>:

For a special camera from Hamamatsu without internal sync generator I need to
build an external video sync generator with the folowing specs.

NON-Interlaced
horizontal sync: periode 64us (15.625 kHz) pulswitdh 6 - 8 us
vertical sync: periode 40- ms (25 Hz) pulswitdh 190 - 250 us

Does anyone have an idea how to build such a thing?

Peter
Oh yes, I have one in FPGA, and you can find examples at many

places of that like www.opencores.com or the Xilinx website.
But there are some cheaps chips that do it all.
Texas, National? Google a bit.
JP

 

[Joerg]

Hi Peter,

Besides chips that do that there is another option if you are handy with micro
controllers. You can configure the internal timers to generate these signals. For
the MSP430 I believe the Texas app note about the "Pong game" shows how to do it.
Probably has the code there as well. The nice thing with this solution is that
you can fine tune the timing quite exactly to your needs, or even change it to a
different video standard.

Regards, Joerg
http://www.analogconsultants.com

 

[Will]

nyffeler@phys.chem.ethz.ch (nyffeler) wrote in message news:<40926e41$1@pfaff2.ethz.ch>...

For a special camera from Hamamatsu without internal sync generator I need to
build an external video sync generator with the folowing specs.

NON-Interlaced
horizontal sync: periode 64us (15.625 kHz) pulswitdh 6 - 8 us
vertical sync: periode 40- ms (25 Hz) pulswitdh 190 - 250 us

Does anyone have an idea how to build such a thing?

Peter

It's a little odd that you have to generate the sync signals for the sensor.
I would expect it to generate the pixel clock by itself, and then another pulse
to indicate the start of a frame. Anyway, the following app note is a quick
intro to do VGA on an FPGA: http://www.xess.com/appnotes/vga.pdf. I remember
reading about other folks doing NTSC with a PIC. Google for "PIC NTSC", oh
here it is:
http://www.rickard.gunee.com/projects/video/pic/howto.php.