The ispLSI 3256E is a High Density Programmable Logic Device containing 512 Registers, 256 Universal I/O pins, five Dedicated Clock Input Pins, 16 Output Routing Pools (ORP) and a Global Routing Pool (GRP) which allows complete inter-connectivity between all of these elements. The ispLSI 3256E features 5V in-system programmability and in-system diagnostic capabilities. The ispLSI 3256E offers non-volatile reprogrammability of the logic, as well as the interconnect to provide truly reconfigurable systems.