>         I'm looking for a high speed ( >4 Msample/s ) and high pin
>         count ( > 32 ) dynamic I/O device,
<snip>

Scenix makes a 50mhz, 20ns per instruction controller called the SX52 and is
has, you guessed it, 52 lines of digital I/O. It is also In System
Programmable. I strongly recommend examining their product line.