Segmentation Hardware Architecture In Memory Management In OS In Hindi | OS Lectures By Deepak

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





Step01:


CPU generates a logical address consisting of two parts

Segment Number
Segment Offset






Segment Number specifies the specific segment of the process from which CPU wants to read the data.
Segment Offset specifies the specific word in the segment that CPU wants to read.


Step02:


For the generated segment number, corresponding entry is located in the segment table.
Then, segment offset is compared with the limit (size) of the segment.


Now, two cases are possible



Case01: Segment Offset greater than= Limit


If segment offset is found to be greater than or equal to the limit, a trap is generated.


Case02: Segment Offset less than Limit


If segment offset is found to be smaller than the limit, then request is treated as a valid request.
The segment offset must always lie in the range [0, limit1],
Then, segment offset is added with the base address of the segment.
The result obtained after addition is the address of the memory location storing the required word.




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