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To develop an ASIP (application specific instruction set processor), development of HW (hardware) and development of SWDE (software development environments) are required. Separate develops of HW and SWDE in a short time are difficult. So HW/SW codesign system is necessary rapid develop of ASIPs. We have developed C-DASH(c-like design automation shell), which is a HW/SW codesign system for designing processors based on ISA (instruction set architecture). We describe the HW/SW codesign system C-DASH, along with a description of a Java processor that directly executes Java byte code is given as an example.