Xilinx - Design Reuse Methodology for ASIC and FPGA Designers.pdf

4The definition of SoRC is just beginning to evolve and in this book is defined as system levelintegration implemented on a Reprogrammable FPGA device. The SoRC definition is similar toSoC since it generally includes a compute engine, 50K of user logic gates and on-chip memory.The definition of SoRC includes partial system integration into multiple chips as well as entiresystem level integration on a single chip. The challenges facing SoC and SoRC designers aresimilar even if the entire system is not integrated into one single chip. However SoRC is notdefined as the gathering of glue logic, since SoRC designs contain system level integration issuesthat separate it from a general glue logic design.1.2 Why Use an FPGA?System-Level-Integration (SLI) using reprogrammable FPGA technology is made possible byadvances in IC wafer technology especially in the area of deep submicron lithography. Today,state-of-the-art waferfabs find FPGAs an excellent mechanism for testing new wafer technologybecause of their reprogrammable nature. Incidentally, this trend in the wafer fabs means thatFPGA companies have early access to the newest deep sub-micron technologies, dramaticallyincreasing the number of gates available to designers as well as reducing the average gate costsooner in the technology life-cycle than before. This trend, together with innovative system levelarchitecture features, is leading FPGAs to become the preferred architecture for SLI.1.2.1 ASIC vs. FPGA Design FlowsFigure 1 illustrates a typical ASIC design flow as compared to a typical FPGA design flow. TheFPGA design flow has some noticeable advantages: