301467-005 Datasheet, PDF (247/426 Pages) Intel Corporation – Express Chipset

Functional Description
R
12.7
Display Interfaces (Intel^®
82915G/82915GV/82915GL/ 82910GL GMCH Only)
The GMCH has three display ports; one analog and two digital. Each port can transmit data
according to one or more protocols. The digital ports are connected to an external device that
converts one protocol to another. Examples of this are TV encoders, external DACs, LVDS
transmitters, and TMDS transmitters. Each display port has control signals that may be used to
control, configure and/or determine the capabilities of an external device.
The analog port is a dedicated port (not multiplexed) on the 82915GV/82915GL/82910GL
GMCH. For the 82915G GMCH, the SDVO ports B and C are multiplexed with the PCI Express
graphics interface and are not available if an external PCI Express graphics device is in use. When
a 915G Express chipset system uses a PCI Express graphics connector, SDVO ports B and C can
be used via an ADD2 (Advanced Digital Display 2) card. Ports B and C can also operate in dual-
channel mode, where the data bus is connected to both display ports, allowing a single device to
take data at twice the pixel rate.
• The GMCH’s analog port uses an integrated 400 MHz RAMDAC that can directly drive a
standard progressive scan analog monitor up to a resolution of 2048x1536 pixels with 32-bit
color at 85 Hz.
• The GMCH’s SDVO ports are each capable of driving a 200-MP pixel rate. Each port is
capable of driving a digital display up to 1600x1200 @ 60Hz. When in dual-channel mode,
the GMCH can drive a flat panel up to 2048x1536 @ 85 Hz or dCRT/HDTV up to
1920x1080 @ 85 Hz.
The GMCH is compliant with DVI Specification 1.0. When combined with a DVI compliant
external device and connector, the GMCH has a high speed interface to a digital display
(e.g., flat panel or digital CRT).
Datasheet
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