Issues in FPGA Technologies (cont)
What type of IO support do I have?
- TTL, CMOS are a given
- Support for mixed 5V, 3.3v IOs?
- 3.3 v internal, but 5V tolerant inputs?
- Support for new low voltage signaling standards?
- GTL+, GTL (Gunning Tranceiver Logic) - used on Pentium II
- HSTL - High Speed Transceiver Logic
- SSTL - Stub Series-Terminate Logic
- USB - IO used for Universal Serial Bus (differential signaling)
- AGP - IO used for Advanced Graphics Port
- Maximum number of IO? Package types?
- Ball Grid Array (BGA) for high density IO