There are various kinds of embedded processor cores available, setting a variety of tasks and applications. Processor Design provides insight into a number of different flavors of processor architectures and their design, software tool generation, implementation, and verification. After a brief introduction to processor architectures and how processor designers sometimes fail to deliver what is expected, the authors introduce a generic flow for embedded processor design on-chip and start exploring the large design space of on-chip processing. Type of processor cores covered include general purpose RISC core, traditional DSP, VLIW approach to signal processing, processor cores that can be customized for specific applications, reconfigurable processors, protocol processors, Java engines, and stream processors. Tools and methodologies for application-specific processor design have closed, along with the processor model and early estimation techniques, and program support tool for custom processors.