176
Intel
82865G/82865GV GMCH Datasheet
Functional Description
NOTE:
1. Single signal software selectable between display enable and Blank#.
5.5.1
Analog Display Port Characteristics
The analog display port provides a RGB signal output along with a HSYNC and VSYNC signal.
There is an associated DDC signal pair that is implemented using GPIO pins dedicated to the
analog port. The intended target device is for a CRT-based monitor with a VGA connector. Display
devices (e.g., LCD panels with analog inputs) may work satisfactory but no functionality has been
added to the signals to enhance that capability.
Table 32. Display Port Characteristics
Parameter
Analog
Digital Port B
Digital Port C
Interface Protocol
RGB DAC
DVO 2.0
DVO 2.0
S
I
G
N
A
L
S
HSYNC
Yes Enable/Polarity
VSYNC
Yes Enable/Polarity
Yes
(1)
BLANK
No
Yes
(1)
STALL
No
Yes
Yes
Field
No
Yes
Yes
Yes
(1)
Display_Enable
No
Image Aspect Ratio
Programmable and typically 1.33:1 or 1.78:1
Square
(1)
Pixel Aspect Ratio
Voltage
RGB 0.7 V p-p
1.5 V
1.5 V
Clock
NA
Differential
Max Rate
350 Mpixel
165/330 Mpixel
Format
Analog RGB
RGB 8:8:8 YUV 4:4:4
Control Bus
DDC1/DDC2B
DDC2B
External Device
No
TMDS/LVDS Transmitter /TV Encoder
Connector
VGA/DVI-I
DVI/CVBS/S-Video/Component/SCART
Table 33. Analog Port Characteristics
Signal
Port Characteristic
Support
RGB
Voltage Range
0.7 V p-p only
Monitor Sense
Analog Compare
Analog Copy Protection
No
Sync on Green
No
HSYNC
VSYNC
Voltage
3.3 V
Enable/Disable
Port control
Polarity adjust
VGA or port control
Composite Sync Support
No
Special Flat Panel Sync
No
Stereo Sync
No
DDC
Voltage
Externally buffered to 5 V
Control
Through GPIO interface