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Fetch-execute cycle

HC - Fetch-execute cycle

QuestionAnswer
List in order the essential registers associated with the fetch-execute cycle PC; MAR; MDR; CIR
What does PC stand for program counter
What does MAR stand for memory address register
What does MDR stand for memory data register
What does CIR stand for current instruction register
What is the MBR - memory buffer register also known as MDR
What is the purpose of the the program counter (PC) it holds the address of the next instruction to be fetched and executed
What is the purpose of the the memory address register (MAR) it holds the address of the currently addressed memory location
What is the purpose of the the memory data register (MDR) it holds the code read from the currently address memory location
What is the purpose of the the current instruction register (CIR) It holds the most recently fetched machine code instruction
What is the typical format for a machine code instruction (what parts does it have) Operation code (op-code); Operand
What is a machine code instruction a binary code that a machine can understand and execute
What does the operation code (op-code) denote the basic machine operation, e.g. add, load or store
What does the operand represent a single item of binary data or the address of a single item of binary data
What components are used to synchronise and control the fetch-execute cycle synchornised by the system clock and controlled by the control unit
How many steps does the fetch phase have four
How many steps does the execute phase have two
What is the register transfer notation used to describe the two steps of the execute phase: 1)The instruction held in the CIR is decoded. 2)The instruction is executed [CIR] decoded and executed
What does the following register transfer notation mean: MAR <-- [PC] The address of the next instruction to be executed, held in the PC, is copied to the MAR
What does the following register transfer notation mean: MBR <-- [Memory]addressed; PC <-- [PC]+ 1 The instruction held at that address is placed in the MBR and simultaneously, the contents fo the PC are incremented by 1 to get ready for the next instruction
What does the following register transfer notation mean: CIR <-- [MBR] The contents of the MBR (MDR) are copied to the CIR. This frees up the MBR for the execute phase.
compiled high-level languages are translated into machine code
Created by: whiteauwielder