Hi all,
thx so much for the valuable input. I could take away that I was looking for the impossible due to my lack of kt / exp with electronics. I will then forget about that idea of having an oscillator at such frequency feeding the arduino and get back to the NOPs.
Grumpy_Mike:
You need your oscillator feeding a shift register parallel in serial out, the shift register is fed with a parallel output of a dual ported RAM chip. Then the address lines on your RAM are fed with a counter derived from the a divide by 8 of the origional oscillator.
At some point you have divided this down enough with the RAM address counter that it is slow enough to trigger an interrupt and have the ISR fill up the RAM through its other port.Or forget the dual ported RAM and have some logic chips generate a test pattern.
Thank you Grumpy_Mike. I will check this out!!
Regards.