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This chapter focuses on the language for instruction set architecture (LISA) and its associated tool suite, which is used for exploring the design space of modern embedded processors. LISA supports automatic generation of software tool suites such as C compiler, assembler, linker, simulator, and profiler and optimizes RTL description within a short time, thus accelerating the design space exploration. The ability of LISA to model a wide range of architectures with continuous encompassing of upcoming architectural trends is accompanied by a powerful framework, which delivers production-quality software tools and optimized RTL implementation. The versatility of the language formalism inspires two overlapping use-cases in the electronic system level (ESL) design automation landscape. The first use-case is for abstract architectural simulation, where the focus is on software tool generation and …