GX1 Datasheet, PDF (139/247 Pages) National Semiconductor (TI) – Processor Series Low Power Integrated x86 Solution

Integrated Functions (Continued)
Table 4-27. CRT Display Modes¹
Resolution
Simultaneous
Colors
Refresh Rate
(Hz)
DCLK² Rate
(MHz)
PCLK³ Rate
(MHz)
640x480
800x600
1024x768
1280x1024
8-bpp
256 colors out of a
palette of 256
16-bpp
64 KB colors
RGB 5-6-5
8-bpp
256 colors out of a
palette of 256
16-bpp
64 KB colors
RGB 5-6-5
8-bpp
256 colors out of a
palette of 256
16-bpp
64 KB colors
RGB 5-6-5
8-bpp
256 colors out of a
palette of 256
60
50.35
25.175
72
63.0
31.5
75
63.0
31.5
85
72.0
36.0
60
50.35
25.175
72
63.0
31.5
75
63.0
31.5
85
72.0
36.0
60
80.0
40.0
72
100.0
50.0
75
99.0
49.5
85
112.5
56.25
60
80.0
40.0
72
100.0
50.0
75
99
49.9
85
112.5
56.25
60
65.0
65.0
70
75.0
75.0
75
78.5
78.5
85
94.5
94.5
60
65.0
65.0
70
75.0
75.0
75
78.5
78.5
85
94.5
94.5
60
108.0
108.0
75
135.0
135
85
157
157
1. This list is not meant to be an complete list of all the possible supported CRT display modes.
2. DCLK is the input clock from the Geode I/O companion. In some cases, DCLK is doubled to keep the Geode I/O com-
panion’s PLL in a desired operational range.
3. PCLK is the graphics output clock to the Geode I/O companion.
Revision 1.0
139
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