How many bits are in the offset portion of the virtual address?

12 bits
Answer. Since there are 4K bytes in a cache block, the offset field must contain 12 bits (212 = 4K).

How many bits are in a virtual address in this system?

Specifically, virtual addresses are 16 bits long so they can address 2^16 bytes. Physical addresses are 20 bits long so that means that our physical memory is of size 2^20 bytes. Our page size is 2^8 bytes or 256 bytes per page.

How do I find the offset of a virtual address?

2. offset = A mod page_size

1. this is the distance from the beginning of the page.
2. e.g. address in the process, A = 10,000.
3. page size = 4k.
4. page offset = 10000 mod 4k = 10,000 mod 4096 = 1908.
5. this calculation is done quickly on the computer since the page size is power of 2, e.g., 4k = 2^12.

How many bits are there in a virtual address how many bits make up the page number and how many make up the offset?

There’s a virtual address which is generated by the CPU and consists of Virtual page number (20 bits) and page offset (12 bits).

How do I find the offset size of my page?

First get page offset by calculating log2(page size in bytes). In your example, page size is 16 KBytes, so log2(16*2^10) is 14; that is, page offset is 14 bits. Then, calculate Physical Page Number (PPN) size by subtracting page offset from total number of bits allocated for physical address.

How many bits are used for the offset?

The offset field requires 14 bits to address 16 KB. That leaves 24 bits for the page fields. Since each entry is 4 bytes, one page can hold 16KB / 4 byte = 2^12 page table entries and therefore requires 12 bits to index one page.

What is offset in operating system?

The last bits of the virtual address are called the offset which is the location difference between the byte address you want and the start of the page. You require enough bits in the offset to be able to get to any byte in the page.

How is offset calculated?

Subtract the smaller number from the larger number. That gives you the offset of the wheel. If the centerline number is smaller than the hub measurement, offset is positive.

How many bits are there in the offset?

The offset field requires 14 bits to address 16 KB.

How many bits are page offset?

The offset field requires 14 bits to address 16 KB. That leaves 24 bits for the page fields.

What is an offset address?

In computer engineering and low-level programming (such as assembly language), an offset usually denotes the number of address locations added to a base address in order to get to a specific absolute address. In this context an offset is sometimes called a relative address.

What is the size of the logical address of a table?

Due the page table entry size is 8 byte (2^6 = 64 bit), 6 bits of the logical address are used for each stage to address it. The offset will have the size of 30 bits.

What is the size of Windows 32 bit virtual address space?

$\\begingroup$Windows 32 bit has a page size of 4KB, yet it’s virtual address size is 4GB.$\\endgroup$ – Johan May 1 ’16 at 16:38 $\\begingroup$And a logical address size of 47-bit corresponds to 140TB. you’d expect the virtual address space to be bigger than the logical size….$\\endgroup$

What is the page count of a logical address?

As far as I understand is the page count defined by the logical address size. The logical address is split up in 3 levels of page tables plus the offset. Due the page table entry size is 8 byte (2^6 = 64 bit), 6 bits of the logical address are used for each stage to address it. The offset will have the size of 30 bits.

What is the size of a 47-bit logical address?

$\\begingroup$And a logical address size of 47-bit corresponds to 140TB. you’d expect the virtual address space to be bigger than the logical size….$\\endgroup$ – Johan May 1 ’16 at 16:41 $\\begingroup$See: d.umn.edu/~gshute/os/address-translation.xhtml$\\endgroup$