Long description

The figure consists of a horizontal block with 13 sub blocks which are labeled NX, AVL, Physical page number, AVL, G, PAT, D, A, PCD, PWT, U bar S, R bar W, and P from left to right, also these blocks define the range of Bytes 0, 1,2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 51, 52, 62, 63 from right to left. The expanded form of each block follows: NX No eXecute, AVL AVaiLable to the OS, G Global page, PAT Page Attribute Table, D Dirty (modified), A Accessed (referenced), PCD Page Cache Disable, PWT Page Write-Through, U slash S User slash Supervisor, R slash W Read slash Write access, P Present (valid).