Gart Table Usage For 4K; Gart Table Usage For 4 Mb - Intel 460GX Software Developer’s Manual

AGP Subsystem
Figure 7-1. GART Table Usage for 4k Pages
39
AGP address (39:12) - APBASE(39:12)
Figure 7-2. GART Table Usage for 4 MB Pages
39
AGP address (39:22) - APBASE(39:22)
7-2
AGP address
(If less than APBASE+Aperture)
(16b if256 MB
of GART space)
21
AGP address
(If less than APBASE+Aperture)
(
8b if 1 GB GART
6b if 256 MB GART
11 0
Offset
24 Bit
18b
GART Entry
GART Table
0
Offset
14 Bit
13b
, GART Entry
)
GART Table
Intel® 460GX Chipset Software Developer's Manual
12b
24b
+
36b Main Memory Address
22b
14b
+
36b Main Memory Address