Integrated Functions (Continued)
4.5.15 CS5530 Display Controller Interface
As previously stated in Section 1.6 “Geode GXM/CS5530
System Designs” on page 11, the GXm processor inter-
faces with either the CS5530 I/O companion chip. This
section will discuss the specifics on signal connections
between the two devices with regards to the display con-
troller.
When the GXm processor is used in a system with the
CS5530 I/O companion chip, the need for an external
RAMDAC is eliminated. The CS5530 contains the DACs,
a video accelerator engine, and the TFT interface.
A GXm processor and CS5530-based system supports
both portable and desktop configurations. Figure 4-16
shows the signal connections for both types of systems.
Portable
Configuration
Power
Control
Logic
FP_ENA_VDD
FP_ENA_BKL
FP_DISP_ENA_OUT
VDD
12VBKL
ENAB
Geode™ GXm
Processor
FP_HSYNC
FP_VSYNC
FP_CLK
HSYNC
VSYNC
CLK
PCLK
VID_CLK
PCLK
VID_CLK
DCLK
TFT
Flat
DCLK
Panel
FP_HSYNC
FP_VSYNC
ENA_DISP
VID_RDY
FP_HSYNC
FP_VSYNC
FP_DISP_ENA
VID_RDY
VID_DATA[7:0]
PIXEL[23:18]*
PIXEL[15:10]*
PIXEL[7:2]*
VID_VAL
FP_DATA[17:12]
FP_DATA[11:16]
FP_DATA[5:0]
R[5:0]
G[5:0]
B[5:0]
VID_DATA[7:0]
PIXEL[17:12]
PIXEL[11:6]
PIXEL[5:0]
VID_VAL
HSYNC_OUT
VSYNC_OUT
Pin 13 Pin 3
Pin 14 Pin 2
Pin 1
CRT_HSYNC
CRT_VSYNC
HSYNC
VSYNC
VGA
Port
DDC_SCL
DDC_SDA
Pin 15
Pin 12
Geode™ CS5530
I/O Companion
IOUTR
IOUTG
IOUTB
Figure 4-16. Display Controller Signal Connections
Revision 3.1
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