US Patent 7765512 Relocatable circuit implemented in a programmable logic device

A circuit is implemented using a programmable logic device (PLD) that includes an array of programmable logic and routing resources. The circuit includes a processor, a configuration port, a relocatable circuit, and an interface circuit. The processor accesses an address space using read and write transactions issued on an interface bus. The programmable logic and interconnect resources are configurable via the configuration port. The relocatable circuit is implemented in a selected region within the array by configuring the programmable logic and interconnect resources in the selected region with configuration data via the configuration port. The interface circuit translates the transactions accessing a portion of the address space assigned to the relocatable circuit into a fixed address space of the relocatable circuit. The configuration data for implementing the relocatable circuit is independent of the portion of the address space assigned to the relocatable circuit.