02-Computer Organization

02-Computer Organization - ComputerOrganization Mehreen Alam

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Computer Organization Mehreen Alam
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Jan 19, 2009 Operating Systems - Mehreen Alam 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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Jan 19, 2009 Operating Systems - Mehreen Alam 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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Jan 19, 2009 Operating Systems - Mehreen Alam 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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Jan 19, 2009 Operating Systems - Mehreen Alam 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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Jan 19, 2009 Operating Systems - Mehreen Alam Control Signal The CPU generates 2 control signals for memory operations Read Write Read Write 0 0 0 1 1 0 1 1 Neither Reading nor Writing Memory Write into Memory Read from Memory Illegal operation (not-defined)
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02-Computer Organization - ComputerOrganization Mehreen Alam

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