5/10/2023 0 Comments J video downloadThe address in the program counter is then incremented (increased) by one.The memory address held in the program counter is copied into the MAR.The fetch-decode-execute cycle is followed by a processor to process an instruction. Using the registers and the key elements of the Von Neumann architecture, we can now look at how an instruction is processed in the fetch-decode-execute cycle. accumulator (ACC) – holds the data being processed and the results of processing.current instruction register (CIR) - holds the instruction that is currently being decoded and executed.memory data register (MDR) - holds the contents found at the address held in the MAR, or data which is to be transferred to primary memory.memory address register (MAR) - holds the address of the current instruction that is to be fetched from memory, or the address in memory to which data is to be transferred.program counter - holds the memory address of the next instruction to be fetched from primary memory.the cycle continues until no more instructions are availableĪ processor based on Von Neumann architecture has five special registers which it uses for processing:.the processor decodes and executes an instruction, before cycling around to fetch the next instruction.instructions are fetched from memory one at a time and in order (serially).data and instructions are both stored in primary memory.data and instructions are both stored as binary digits.The key elements of Von Neumann architecture are: Von Neumann architecture is the design upon which many general purpose computers are based.
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