User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
R
302
Bit Description
31:26 Reserved for address bits 31 downto 26
25:19 Fence Lower Bound : Memory address bits 25 downto 19 (Must be size aligned)
18:15 Reserved
14:13 Reserved: MBZ (“00”)
12 Tile walk
0 = X Major
1= Y Major.
11 Reserved
10:8 Fence size:
000 = 512 KB
001 = 1 MB
010 = 2 MB
011 = 4 MB
100 = 8 MB
101 = 16 MB
110 = 32 MB
111 = Reserved.
7 Reserved
6:4 Fence Pitch:
000 = 1 Tile
001 = 2 Tiles
010 = 4 Tiles
011 = 8 Tiles
100 = 16 Tiles
101 = 32 Tiles
110 = Reserved
111 = Reserved
3:1 Reserved
0 Fence Valid:
0 = Unused
1 = Valid