Systems Architecture

Systems Architecture

1. Cpu

   • Registers
     • MAR
       • memory address register (MAR) - holds the address of the current instruction that is to be fetched from memory
     • MDR
       • memory data register (MDR) A register used for holding information
     • PC
       • The program counter, commonly called the instruction pointer in Intel x86 and Itanium microprocessors
     • Alu
       • Arithmetic / Logic unit In computing, an arithmetic logic unit is a combinational digital circuit that performs arithmetic and bitwise operations on integer binary numbers.
     • Cu
       • Control unit The control unit is a component of a computer's central processing unit that directs the operation of the processor. It tells the computer's memory, arithmetic logic unit and input and output devices how to respond to the instructions that have been sent to the processor.
     • Ac
       • Accumulator In a computer's central processing unit, the accumulator is a register in which intermediate arithmetic and logic results are stored