I need a single chip solution for a control system and DSP
application.
The primary consideration is board area. The second, cost.
Here's what I'm looking for:
- 5V supply and I/O.
- Embedded ADC (at least 1, preferably 8). Slow rate (50 Hz).
- Small FPGA fabric. About the size of a small spartan.
- Embedded block ram (4 KBytes).
- Flash FPGA. Would like not to have separate config prom.
- Low I/O count. I only need about 30 pins.

Does anything like this exist? If 5V I/O is not possible, what's
needed to translate about 12 pins from 3.3/1.2 to 5V?

Also, what's envolved for FPGA based software defined radio? I'd like
to build an RC (as in radio control airplane) receiver. Most FM
radios hop between 2 frequencies to encode pulse widths which in turn
drive the RC servos. So nothing digital. It just needs to extract
the pulse train from the FM. I would consider trading an FM receiver
chip for an external high-speed ADC and a larger FPGA if it buys
enough flexibility.

Regards,
Tom