AMD Geode LX 800@0.9W - Manual (Page 361)

AMD Geode™ LX Processors Data Book 361
Display Controller Register Descriptions 33234H
6.6.19 VGA CRT Controller Registers
The CRTC registers are accessed by writing an index value to the CRTC Index register (3B4h or 3D4h) and reading or writ-
ing the register using the CRTC Data register (3B5h or 3D5h). See the description of the I/O Address Select bit in the Mis-
cellaneous Output register (Section 6.6.17.1 on page 356) for more information on the I/O address of the CRTC registers.
The CRT timings are controlled by the CRT Controller registers when the VGA is active. Various third-party VGA adapters
implement these registers differently, and so different cards can produce different timings with the same settings. The set-
tings shown in Table 6-53 are recommended for various VGA modes when programming the CRTC registers.
Note: The Extended VGA Registers are accessed through the CRTC interface. This section only discusses the base VGA
registers, however. See Section 6.6.23 "VGA Block Extended Registers" on page 384 for more information on the
extended registers.
Table 6-53. CRTC Register Settings
VGA Mode
Index 00 01 02 03 04 05 06 07 0D 0E 0F 10 11 12 13
0 2D 2D 5F 5F 2D 2D 5F 5F 2D 5F 5F 5F 5F 5F 5F
1 27 27 4F 4F 27 27 4F 4F 27 4F 4F 4F 4F 4F 4F
2 28 28 50 50 28 28 50 50 28 50 50 50 50 50 50
3 90 90 82 82 90 90 82 82 90 82 82 82 82 82 82
4 29 29 51 51 29 29 51 51 29 51 51 51 51 51 51
5 8E 8E 9E 9E 8E 8E 9E 9E 8E 9E 9E 9E 9E 9E 9E
6 BF BF BF BF BF BF BF BF BF BF BF BF 0B 0B BF
7 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 3E 3E 1F
8 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
9 4F 4F 4F 4F C1 C1 C1 4F C0 C0 40 40 40 40 41
A 0D 0D 0D 0D 00 00 00 0D 00 00 00 00 00 00 00
B 0E 0E 0E 0E 00 00 00 0E 00 00 00 00 00 00 00
C 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
D 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
10 9B 9B 9B 9B 9B 9B 9B 9B 9B 9B 83 83 E9 E9 9B
11 8D 8D 8D 8D 8D 8D 8D 8D 8D 8D 85 85 8B 8B 8D
12 8F 8F 8F 8F 8F 8F 8F 8F 8F 8F 5D 5D DF DF 8F
13 14 14 28 28 14 14 28 28 14 28 28 28 28 28 28
14 1F 1F 1F 1F 00 00 00 0F 00 00 0F 0F 00 00 40
15 97 97 97 97 97 97 97 97 97 97 65 65 E7 E7 98
16 B9 B9 B9 B9 B9 B9 B9 B9 B9 B9 B9 B9 04 04 B9
17 A3 A3 A3 A3 A2 A2 C2 A3 E3 E3 E3 E3 C3 E3 A3
18 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF