The microarchitecture is related to, but not the same as, the instruction set architecture. The instruction set architecture is near to the programming model of a processor as seen by an assembly language programmer or compiler writer, which includes the execution model, processor registers, memory address modes, address and data formats, etc. The microarchitecture (or computer organization) is mainly a lower level structure and therefore manage a large number of details that are hidden in the programming model. It describes the inside parts of the processor and how they work together in order to implement the architectural specification.
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