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  1. Instruction processing style. Specifies the number of “operands” an instruction “operates” on and how it does so. 0, 1, 2, 3 address machines: 0-address: stack machine (push A, pop A, op) 1-address: accumulator machine (ld A, st A, op A) 2-address: 2-operand machine (one is both source and dest)

  2. Instruction Set Architecture –the portion of the machine visible to the assembly level programmer or to the compiler writer –To use the hardware of a computer, we must speakits language –The words of a computer language are called instructions, and its vocabulary is called an instruction set instruction set software hardware

  3. Instruction Set Architecture. “Instruction Set Architecture is the structure of a computer that a machine language programmer (or a compiler) must understand to write a correct (timing independent) program for that machine.”. – IBM, Introducing the IBM 360 (1964)

  4. An Instruction Set Architecture (ISA) defines the communication rules between the hardware and software of the computer. The ISA is a design principle (conceptual) and not stored in a computer’s memory. Some things an ISA defines: - How binary instructions are formatted. - What instructions are available to be.

  5. The objectives of this module is to understand the importance of the instruction set architecture, discuss the features that need to be considered when designing the instruction set architecture of a machine and look at an example ISA, MIPS.

  6. Overview. Sail is a language for defining the instruction-set architecture (ISA) semantics of processors: the architectural specification of the behaviour of machine instructions. Sail is an engineer-friendly language, much like earlier vendor pseudocode, but more precisely defined and with tooling to support a wide range of use-cases.

  7. Instruction Set Architecture •Instruction set architecture is the structure of a computer that a machine language programmer must understand to write a correct (timing independent) program for that machine. •The instruction set architecture is also the machine description that a hardware designer must