Self-doubt

Question

For a page size of 200 words, what is the page number and offset for a logical address of 1142?

Comments

logical address of 1142, is it in decimal or hexadecimal?

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This is a very interesting topic of OS. I think.

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Offset:- The offset is the distance (in bytes) relative to the start of the page. I.e.,  offset= logical_address mod page_size. The bits for this portion of the logical address are not translated (given power of two page size).The logical (virtual) page number is number of (virtual) page counting from zero.

As you noted, the physical page is determined by the translation table, indexed using the logical (virtual) address.

Once the physical page number had been found, the physical address of the start of that page is found by multiplying the physical page number by the page size. The offset is then added to determine the precise physical address. I.e.,

physical address = (physical_page_number * page_size) + offset

Answer 1

Offset:- The offset is the distance (in bytes) relative to the start of the page. I.e.,

Offset= logical_address mod page_size.

Physical address = (physical_page_number * page_size) + offset

Page Number=Logical Address / Page Size

According to question given, 

Page number= Logical Address / Page Size = 1142/ 200 = 5           

Offset = logical_address mod page_size = 1142%200 = 142         

Answer 2

we can represent memory in byte addresable frmte or in word addressable formate it is clear so  200 words can be addressable using 8 bits ......so last  8 bit is for  page size(offset) annd remainning for page number.

Answer 3

let make some assumption:- 1.system is word addressable 2.given address is in hexadecimal....

now

(1142)₁₆=(0001 0001 0100 0010)...  

page size=200 word ->log₂200 =7.64  (8 bits are needed )for offset value...

now in above address ..last 8bit (0100 0010) represent the offset value and remaining bit (0001 0001) represent the table block no.