Virtual addresses are divided into an offset, an 11-bit second-level page table field, and a 9-bit top-level page table field.
The maximum size of the Page Directory and Page Tables, which also happens to be the Page Frame size, is 4 Kbytes. Page Directory and Page Table entries are each 4 bytes long. The high-order 20 bits identify the page table or page frame's foundation. There are 227 addresses in the memory's 128 MB address area. However, there are 224 words because each word takes up 8 (23) bytes. To address each word, you need log2 224, or 24 bits. A 9-bit address exists in 512 x 8 RAM; we will divide this address into 2 and 7-bit addresses.
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