1.1.1 Structure And Function Of The Processor- (a. ALU, CU, Register, Buses)
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14 Terms
What is the purpose of the Arithmetic Logic Unit(ALU)?
Performs all of the arithmetic and logical comparisons of the CPU
What is the purpose of the Control Unit(CU)?
Sends out control signals to other parts of the CPU. Executes instructions by following FDE cycle.
What two parts is the CU made of?
The clock - coordinates the CPU's activity.
The decoder - decodes program instructions.
What are buses used for?
Buses are used to send control signals and data between the processor and other components.
What are the three buses?
The data bus
The address bus
The control bus
What is the function of the data bus?
The data bus allows data and instructions to be transferred between the processor, memory and input/output
What is the function of the address bus?
The address bus sends addresses from processor to the main memory and input/output
What is the function of the control bus?
The control bus sends control signals to other devices inside the computer system.
What are registers?
Registers are tiny amounts of super-quick memory within the CPU.
Used to hold information needed for the CPU to work.
Each register holds a specific piece of information.
What is the function of the Memory Data Register(MDR)?
Holds the data that has been retrieved from memory, or that is about to be stored in memory.
What is the function of the Memory Address Register(MAR)?
Holds the address of the location in memory where data is to be retrieved or stored.
What is the function of the Program Counter(PC)?
Holds the memory location address of the next instruction to be performed by the CPU.
The PC does not store the instruction itself.
Increments by 1
What is the function of the accumulator?
Holds the result of calculations and operations performed by the arithmetic logic unit (ALU).
What is the function of the Current Instruction Register(CIR)?
The Current Instruction Register (CIR) is used to store the current instruction that the CPU is working on.
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