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L8 CU - Computer Science 230H CU Control Unit Prepared by...

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Computer Science 230H CU – Control Unit Prepared by Michael Jack Fall 2007
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ALU 2 References The information and figures for the following slides were prepared from the following source: Patterson, D., and Hennessy J., Computer Organization and Design, 3rd edition, 2005 Stallings, W., Computer Organization and Architecture: Designing for Performance 7 th edition, 2006 Hircock B., Computer Science 230 Course Notes
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ALU 3 The job of a Control Unit (CU) is to cause things happen! It is essentially an engine that runs the entire computer Each instruction cycle consists of a set of micro-operations that generate control signals. CU has two basic responsibilities: Cause processor to execute micro-operations in the proper sequence. Generate control signals to cause each micro-operation be executed. CU issues control signals: To the processor to cause data exchange with memory and I/O modules. To the processor to move data between registers. To cause the ALU to perform a specified function To regulate other internal operations. Input to the CU consists of: Instruction register Flags Control signals from external sources (e.g. interrupts) Introduction
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ALU 4 The execution of a program consists of the sequential execution of instructions Each instruction is executed during an instruction cycle made up of shorter subcycles (e.g. fetch, indirect, execute, interrupt.) The performance of each subcycle involves one or more shorter operations – micro-ops. Micro-Operations
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ALU 5 Memory address register (MAR): Connects directly to the address bus. Specifies the address in memory for a read or write operation. Memory data/buffer register (MBR) Connects directly to the data bus.
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