DSP 104-plus, Reference Manual

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158004.B00 31
RESOLUTION SIMULTANEOUS
COLOURS REFRESH
RATE DOTCLK RATE
72Hz 31.5MHz
8 BPP. 256 colours out of a
palette of 256.
75Hz 31.5MHz
60Hz 25.175MHz
72Hz 31.5MHz
640 X 480
16 BPP. 64k colours 5-6-5.
75Hz 31.5MHz
60Hz 40.0MHz
72Hz 50.0MHz
8 BPP. 256 colours out of a
palette of 256.
75Hz 49.5MHz
60Hz 40.0MHz
72Hz 50.0MHz
800 x 600
16 BPP. 64k colours 5-6-5.
75Hz 49.5MHz
60Hz 65MHz
72Hz 75.0MHz
8 BPP. 256 colours out of a
palette of 256.
75Hz 78.5MHz
60Hz 65MHz
72Hz 75.0MHz
1024 x 768
16 BPP. 64k colours 5-6-5.
75Hz 78.5MHz
60Hz 108.0MHz
1280 X 1024 8 BPP. 256 colours out of a
palette of 256.
75Hz 135.0MHz
TABLE 6 - CRT DISPLAY RESOLUTIONS
Connection to flat panel displays is made through the 40-way 0.05” pitch connector
J8. Connection is made from the J8 connector to flat panels using a ribbon cable.
DSP Design also makes a range of interface boards for the display end of this 40-
way cable. These interface boards suit many 640 x 480, 800 x 600 and 1024 x 768
TFT LCD displays. The interface boards, known as the TFTIF range, solve the
otherwise tedious problem of wiring between the TP400 and the display. These
interface boards carry power to the displays from the TP400, and can switch off
power to the LCD when the display is placed into a suspend mode. The interface
boards also convey a backlight enable signal from the TP400 to the display, from
where it can be taken to the backlight inverter. Appendix F contains descriptions and
pin assignments of these interface boards. See Appendix D for ordering information.
The TP400 drives the flat panel signals at 3.3V levels, rather than 5V levels. These
3.3V signals are compatible with both 5V and 3.3V displays. The 40-way ribbon cable
carries both 5V and 3.3V power supplies to the flat panel display.
3.10.3 External Graphics Cards, and No Graphics
The BIOS searches for VGA boards on the PC/104 bus or PC/104-Plus bus. If these
boards are located then the Geode GX1 internal graphics controller may disabled and
the off-board VGA board is used instead. Alternatively, it is possible to operate with
the two display controllers simultaneously, for operating systems such as Windows
98 that support multiple displays. The operation of the TP400 in the presence of an