Presentation on theme: "TEAM 1: Miguel Harmant Rodney Rodriguez Elias Crespo Javier Parra Alfredo Alonso Marc-Wayne Anglin."— Presentation transcript:
TEAM 1: Miguel Harmant Rodney Rodriguez Elias Crespo Javier Parra Alfredo Alonso Marc-Wayne Anglin
WHAT IS A MICRO-INSTRUCTION? WHAT ARE MICRO-OPERATIONS? Single instruction in a micro-program. Smaller series of steps that compose a micro-instruction. Atomic operation by the CPU. BASIC MICRO-OPERATIONS Data transfers between registers. Data Transfer from registers to memory Data transfer from memory to registers Logic and arithmetic operations.
ALU - does the actual computation or processing of data. Registers - set of internal memory. Internal Data paths (Bus) - need to transfer data between the various registers and the ALU. External Data paths - distribute data to other components. CONTROL UNIT -controls the movement of data and instruction into and out of the CPU and controls the operation of the ALU.
Is the circuitry that controls the flow of information through the CPU. It coordinates the micro-operations of other units within it. In other words, it is the brain within the brain.
Sequencing Stepping through the micro-instructions. Maintaining proper sequence. Execution Interpreting input signals into output control signals. Executes Control signals.
FETCH-CYCLEControl signal Sequence MAR <- (PC) Control unit activates signal to open gates between PC and MAR MBR <- (memory) Open gates between MAR and address bus Memory read control signal Open gates between data bus and MBR IR <- (MBR) Open gates from MBR to Instruction Register
RISC architecture CISC architecture Hard-wired Designed as a combinatorial and sequential logic circuit. Input logic signals are transformed into output logic signals, which are the control signals. Faster. Micro-programmed The control signal values for each micro-operation are stored in memory. Micro-operations that compose control signals are read from memory. Simpler to modify and construct.
Instruction Decoder Takes the input from the op-code field of the instruction register and activates one of its 8 output lines. Each line corresponds to one of the instructions in the computer's instruction set. Different Control Signals are produced depending on the op-code.
Ring Counter Continuously cycles from t0 to t5.
1. What are the basic micro-operations? 2. What are the three main components of the CPU? 3. What is the Control Unit? 4. What are the two basic functions of the Control Unit? 5. What are the two types of Control Unit? 6. How are they constructed? 7. What is RISC and CISC? 8. Which are the differences between the two types of Control Unit? 9. What are the advantages of each? 10. What are the disadvantages of each?