XC4000 Series devices are implemented with a regular,flexible, programmable architecture of Configurable LogicBlocks (CLBs), interconnected by a powerful hierarchy ofversatile routing resources, and surrounded by a perimeterof programmable Input/Output Blocks (IOBs). They havegenerous routing resources to accommodate the mostcomplex interconnect patterns.The devices are customized by loading configuration datainto internal memory cells. The FPGA can either activelyread its configuration data from an external serial orbyte-parallel PROM (master modes), or the configurationdata can be written into the FPGA from an external device(slave and peripheral modes).XC4000 Series FPGAs are supported by powerful andsophisticated software, covering every aspect of designfrom schematic or behavioral entry, floor planning, simulation,automatic block placement and routing of interconnects,to the creation, downloading, and readback of theconfiguration bit stream.Because Xilinx FPGAs can be reprogrammed an unlimitednumber of times, they can be used in innovative designswhere hardware is changed dynamically, or where hardwaremust be adapted to different user applications.FPGAs are ideal for shortening design and developmentcycles, and also offer a cost-effective solution for productionrates well beyond 5,000 systems per month. For lowesthigh-volume unit cost, a design can first be implemented inthe XC4000E or XC4000X, then migrated to one of Xilinx’compatible HardWire mask-programmed devices.
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