نظم تشغيل 2- المحاضرة الخامسة

Main Memory:
Background
? memory is central to the operation of a modern computer system. Memory consists of a large array of words or bytes, each with its own address.
? The CPU fetches instructions from memory according to the value of the program counter. These instructions may cause additional loading from and storing to specific memory addresses.
? A typical instruction-execution cycle, for example, first fetches an instruction from memory. The instruction is then decoded and may cause operands to be fetched from memory.
? After the instruction has been executed on the operands, results may be stored back in memory. The memory unit sees only a stream of memory addresses; it does not know how they are generated.
Main Memory:
Background
? memory is central to the operation of a modern computer system. Memory consists of a large array of words or bytes, each with its own address.
? The CPU fetches instructions from memory according to the value of the program counter. These instructions may cause additional loading from and storing to specific memory addresses.
? A typical instruction-execution cycle, for example, first fetches an instruction from memory. The instruction is then decoded and may cause operands to be fetched from memory.
? After the instruction has been executed on the operands, results may be stored back in memory. The memory unit sees only a stream of memory addresses; it does not know how they are generated.