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This paper describes the development of a synthesizable SoC platform using OpenCores processor and WISHBONE on-chip bus. The platform includes a OpenRISC 1200 microprocessor, some basic peripherals, such as on-chip RAM, GPIO, UART, debug interface, VGA controller and WISHBONE bus and uses the set of development environment including compiler, assembler, debugger that is built for system debugging and software development. All of designed SoC and IPs are verified in the various test environment and are prototyped using Xilinx Spartan3 FPGA development board. Also, the platform is implemented to a single chip using Magnachip cell library based on 0.18 mum 1-poly 6-metal technology.