so i was studying about paging and after studying for a while come to a conclusion, but i was still some what unsatisfied, so i asked chatGPT and it gave me this answer. this seems pretty right to me, but still i need some help if this is what actually what happens in paging or not!
the response
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Let’s consider a simple example to understand how paging works in a computer system.
Consider a computer system with a CPU and a Main Memory, and assume that each memory location is a byte with an address. The logical address space of the system is 16-bit, i.e., it can address up to 2^16 = 65,536 memory locations.
However, the Main Memory is limited and can hold only 4,096 bytes (i.e., 4KB of memory). To address this problem, the Operating System (OS) divides the Main Memory into fixed-sized blocks called pages and the logical address space into fixed-sized blocks called page frames. Each page frame is the same size as a page in the Main Memory.
For this example, let’s assume that the page size is 1KB and the page frame size is also 1KB. Hence, the Main Memory contains 4 pages and the logical address space contains 65 pages.
Now, the CPU generates a logical address whenever it executes an instruction that requires access to memory. This logical address is passed to the Memory Management Unit (MMU), which is a hardware component responsible for mapping the logical address to a physical address.
Let’s consider the following scenario:
The CPU fetches an instruction from memory and decodes it.
The instruction requires access to memory location 0x2345 (hexadecimal representation of the logical address).
The MMU receives the logical address 0x2345 from the CPU and checks the page table to determine the physical page that corresponds to the page frame containing the logical address.
The page table entry for page 0x23 indicates that the corresponding physical page is 2.
The MMU adds the page frame offset (0x45 in this case) to the physical page number to obtain the physical address.
The physical address is 0x2045 (2 * 0x1000 + 0x45), where 0x1000 is the page size in bytes.
The MMU passes the physical address 0x2045 to the Main Memory, which retrieves the data from the specified location and returns it to the CPU.
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