GoForSmoke:
What you do with the data is going to make a difference. Hope it's not high-res face or voice recognition.
Nah, I had some dumbass idea to make a simple oscilloscope out of it. Just something to look at dv/dt.
westfw:
high-speed ADCs with parallel interfaces
You might be able to connect those via the memory interface, or via some sort of DMA scheme. But you probably can't get 100MHz; that's only 10ns for each byte, which is down near the propagation delay for individual logic-gate chips...
In the end if I can't get a microcontroller that can keep up I am thinking of a pure logic solution that just plows it into static RAM once the trigger voltage is hit, maybe with a CPLD or an FPGA, and then have the microcontroller read it out of memory and analyze it. I have to figure all that out, it is outside of my skill level right now but probably not for very long.