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Paging With Segmentation Hardware Architecture In OS In Hindi | NET GATE-OS By Deepak Garg

Translating Logical Address into Physical Address-

CPU always generates a logical address.
A physical address is needed to access the main memory.

Following steps are followed to translate logical address into physical address-


Step-01:
CPU generates a logical address consisting of three parts-
Segment Number
Page Number
Page Offset


Segment Number specifies the specific segment from which CPU wants to reads the data.
Page Number specifies the specific page of that segment from which CPU wants to read the data.
Page Offset specifies the specific word on that page that CPU wants to read.

Step-02:
For the generated segment number, corresponding entry is located in the segment table.
Segment table provides the frame number of the frame storing the page table of the referred segment.
The frame containing the page table is located.

Step-03:
For the generated page number, corresponding entry is located in the page table.
Page table provides the frame number of the frame storing the required page of the referred segment.
The frame containing the required page is located.

Step-04:
The frame number combined with the page offset forms the required physical address.
For the generated page offset, corresponding word is located in the page and read.



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