Functional Description CP308
Page 2 - 14 ID 1027-4487, Rev. 3.0
P R E L I M I N A R Y
2.3.5.1 Graphics Memory Usage
The GS45 GMCH supports the Dynamic Video Memory Technology (DVMT 5.0). This
technology ensures the most efficient use of all available memory for maximum 3D graphics
performance. DVMT dynamically responds to application requirements allocating display and
texturing memory resources as required.
The graphics controller is fed with data from the GS45 memory controller. The graphics perfor-
mance is directly related to the amount of memory bandwidth available.
2.3.5.2 Graphics Resolution
The GS45 GMCH can directly drive a progressive scan analog monitor up to a resolution of
2048 x 1536 pixels (QXGA).
2.3.5.3 VGA Analog Interface and Connector J3
The 15-pin female connector J3 is used to connect a VGA analog monitor to the CP308.
* Pin 10 is normally defined as Ground but is used on the CP308 as detection signal of a con-
nected monitor if the uEFI BIOS setting for the CP308 is “AUTO” (the uEFI BIOS default set-
ting is “FRONT”).
Note ...
If the automatic VGA detection mechanism on the CP308 is used, the user
must ensure that the VGA cable and the connected monitor have a GND signal
on pin 10. Otherwise the interface is not operable.
Figure 2-2: D-Sub VGA Con. J3
Table 2-11: D-Sub VGA Connector J3 Pinout
PIN SIGNAL FUNCTION I/O
1 Red Red video signal output O
2 Green Green video signal output O
3 Blue Blue video signal output O
10* VGA_DETECT Monitor detection signal I
13 Hsync Horizontal sync. TTL Out
14 Vsync Vertical sync. TTL Out
12 Sdata
I
²
C data
I/O
15 Sclk
I
²
C clock
I/O
9 VCC Power +5V, 1.5 A fuse
protection
O
5,6,7,8 GND Ground signal --
4,11 NC -- --
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