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Lec2_System_Interconnect1_student11

Lec2_System_Interconnect1_student11 - Lecture 2 Computer...

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CC2202 1 Lecture 2 Computer Instruction and Interconnection
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CC2202 2 Last Week We learnt Evolutions and Generations of Computer The Conceptual view of a computer Difference between Architecture and Organization We will learn Program and Instruction Processor and Operations Interrupt Units Connection and Operations
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CC2202 3 Computer System Different Generations of Intel CPU
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CC2202 4 Processor Which processor should you select? head2right Generally, the faster the processor, the more expensive the computer
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CC2202 5 Program Concept Hardwired systems are inflexible General purpose hardware can do different tasks, given correct control signals Instead of re-wiring, supply a new set of control signals What is a program? A sequence of steps For each step, an arithmetic or logical operation is done For each operation, a different set of control signals is needed
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CC2202 6 Hardware and Software Approach For each operation a unique code is provided e.g. ADD, MOVE A hardware segment accepts the code and issues the control signals
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CC2202 7 Components The Control Unit and the Arithmetic and Logic Unit constitute the Central Processing Unit Data and instructions need to get into the system and results out Input/output Temporary storage of codes and results is needed Main memory
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CC2202 8 Computer Components: Top Level View
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CC2202 9 Computer Components: Top Level View CPU exchanges data with Memory MAR – specifies The address in memory For next read or write MBR – contains data To be written into Memory I/O BR – used for exchange of Data between I/O module and CPU I/O AR – specifies a particular I/O device
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CC2202 10 Instruction Cycle Two steps: Fetch Execute
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CC2202 11 Fetch Cycle Program Counter (PC) holds address of next instruction to fetch Processor fetches instruction from memory location pointed to by PC Increment PC Unless told otherwise
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