instruction cycle ppt
- 1. Computer Architecture & Assembly Language SubmittedTo: Shweta Singh ma’am Submitted By: Sheetal Singh BCA 2nd year 1590409046
- 3. INSTRUCTION CYCLE • A instruction cycle(sometimes called fetch decode cycle) • It is basic operational process of computer in which a computer retrieves a program instruction from its memory that determines what actions the instruction dictates and carries out those action FETCH INDIRECT EXECUTE INTERUPT
- 4. COMPONENT OF INSTRUCTION CYCLE • PROGRAM COUNTER (PC) • MEMORY ADDRESS REGISTER (MAR) • MEMORY DATA REGISTER (MDR) • INSTRUCTION REGISTER (IR) • CONTROL UNIT (CU) • ARITHEMETIC LOGIC UNIT (ALU)
- 5. Flow chart of instruction cycle
- 7. STEPS OF INSTRUCTION CYCLE •Fetch the Instruction:The next instruction is fetched from the memory address that is currently stored in the program counter (PC), and stored in the instruction register(IR). •Decode the Instruction: During this cycle the encoded instruction present in the IR (instruction register) is interpreted by the decoder..
- 8. •Read the Effective Address: Direct Memory Instruction - Nothing is being done in clock plus. Indirect Memory Instruction -The effective address is being read from the memory. •Execute the Instruction:The control unit of the CPU passes the decoded information as a sequence of control signals to the relevant function units of the CPU to perform the actions required by the instruction.