Lec03-Computer Organization

Lec03-Computer Organization - National University of...

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Operating System Spring 07 National University Lec 03- Prepared by Uzma Maroof uzma.maroof@nu.edu.pk
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Computer Operation Computer Operation Recap Recap
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3 Operations with Memory Operations with Memory Two operations can be performed with memory Read Write To perform these operations, 3 type of information is required: Data Control (Read/Write) Address
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4 RAM and CPU RAM and CPU 0 15 . . . . . . . . . . . . . . . . . . . . . . . . RAM CPU R . . . . . . . . Address Bus Data Bus W . . . . . . . . C O N T R O L B U S Memory Address Register Memory Buffer Register
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5 Address Address The Address at which the operation is to be performed, is generated by the CPU This address is passed on the “Address bus” And is temporarily stored in “Memory Address Register” “Memory Address Register” selects one and only 1 Address at a time.
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6 Address Address 0 15 . . . . . . . . . . . . . . . . . . . . . . . . RAM CPU R . . . . . . . . Address Bus Data Bus W . . . . . . . . C O N T R O L B U S Memory Address Register Memory Buffer Register 3 3 3
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Control Signal Control Signal The CPU generates 2 control signals for memory operations Read Write Read Write 0 0 0 1
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Lec03-Computer Organization - National University of...

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