SBC-GX1 Technical Manual Detailed hardware description
Graphics controller
The AMD Geode GX1 processor contains a high performance graphics controller. With
the support of the CS5530, this can be used to drive TFT LCD flat panel and CRT
displays simultaneously. The graphics controller is supported by a fully PC compatible
video BIOS which enables it to support all standard VGA and XGA graphics modes.
The video memory is shared with the main system memory and can be configured in the
BIOS to allocate either 1.5MB, 2.5MB or 4MB of memory to the video controller. Once
this memory is allocated it is no longer available for application use. The BIOS displays a
message during the boot process to show how much memory is allocated to the
graphics.
A full explanation of the graphics controller operation can be found in the GX1 and
CS5530 data sheets which are included on the support CD.
The following table shows the video resolutions supported by the GX1 with the
corresponding number of bits per pixel.
Resolution Bits per pixel
640 x 480 8/16
800 x 600 8/16
1024 x 768 8/16
1280 x 1024 8
When configured for TFT flat panel support the following table shows the correspondence
between the panel data bus signals FPD0-FPD17 and the display colour bits:
9-bit TFT Panel data bus bit 18-bit TFT 12-bit TFT
640x480 1024x768
FPD 17 R5 R5 R5 R5
FPD 16 R4 R4 R4 R4
FPD 15 R3 R3 R3 R3
Even
FPD 14 R2 R2 R2
FPD 13 R1 R1
FPD 12 R0 R0
Odd
FPD 11 G5 G5 G5 G5
FPD 10 G4 G4 G4 G4
FPD 9 G3 G3 G3 G3
Even
FPD 8 G2 G2 G2
FPD 7 G1 G1
FPD 6 G0 G0
Odd
continued…
© 2004 Arcom Issue D 68
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