Intel 460GX - GART Table Usage for 4 K; GART Table Usage for 4 MB

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