The textbook "Processor Design" offers comprehensive insights into various architectures of processors as well as their design, software tool generation, implementation, and verification. After a brief introduction to the fundamentals of processor architectures and the challenges faced by processor developers, a generic process for designing embedded on-chip processors is presented. The book explores the extensive design space of on-chip processing and covers different types of processor cores, including general RISC cores, traditional DSPs, VLIW approaches to signal processing, and customizable processor cores for specific applications. Additionally, co-processor and multi-core design approaches are described, providing application-specific performance that exceeds the capabilities of single-core designs.