Intel® 945G/945GZ/945GC/ 945P/945PL Express Chipset Family ...
Intel® 945G/945GZ/945GC/ 945P/945PL Express Chipset Family ...
Intel® 945G/945GZ/945GC/ 945P/945PL Express Chipset Family ...
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10.6.2 Digital Display Interface<br />
Functional Description<br />
The GMCH has several options for driving digital displays. The GMCH contains two SDVO<br />
ports. On the 82<strong>945G</strong>/82<strong>945G</strong>C GMCH these ports are multiplexed on the PCI <strong>Express</strong> interface.<br />
When an external PCI <strong>Express</strong> graphics accelerator is not present, the GMCH can use the<br />
multiplexed SDVO ports to provide extra digital display options. These additional digital display<br />
capabilities may be provided through an ADD2 card that is designed to plug into a PCI <strong>Express</strong><br />
connector.<br />
10.6.2.1 Multiplexed Digital Display Channels – Intel ® SDVOB and Intel ®<br />
SDVOC<br />
The 82<strong>945G</strong>/82<strong>945G</strong>C/82<strong>945G</strong>Z GMCH has the capability to support digital display devices<br />
through two SDVO ports. For the 82<strong>945G</strong>/82<strong>945G</strong>C GMCH, when an external graphics<br />
accelerator is used via the multiplexed PCI <strong>Express</strong> port, these SDVO ports are not available.<br />
The shared SDVO ports each support a pixel clock up to 200 MHz and can support a variety of<br />
transmission devices. When using a dual-channel external transmitter, it will be possible to pair<br />
the two SDVO ports in dual-channel mode to support a single digital display with higher<br />
resolutions and refresh rates. In this mode, the GMCH is capable of driving the pixel clock up to<br />
400 MHz.<br />
SDVO_CTRLDATA is an open-drain signal that acts as a strap during reset to tell the GMCH<br />
whether the interface is a PCI <strong>Express</strong> interface or an SDVO interface. When implementing<br />
SDVO, either via ADD2 cards or with a down device, a pull-up is placed on this line to signal to<br />
the GMCH to run in SDVO mode and for proper GMBus operation.<br />
10.6.2.1.1 ADD2/ADD2+ Card<br />
When a <strong>945G</strong>/<strong>945G</strong>C <strong>Express</strong> chipset platform uses a PCI <strong>Express</strong> connector, the multiplexed<br />
SDVO ports may be used via an ADD2 card for <strong>945G</strong>C and ADD2/ADD2+ card for <strong>945G</strong>. The<br />
ADD2/ADD2+ card will be designed to fit a standard PCI <strong>Express</strong> (x16) connector.<br />
10.6.2.1.2 TMDS Capabilities<br />
The GMCH is compliant with DVI Specification 1.0. When combined with a DVI compliant<br />
external device and connector, the GMCH has a high-speed interface to a digital display<br />
|(e.g., flat panel or digital CRT). When combining the two multiplexed SDVO ports, the GMCH<br />
can drive a flat panel up to 2048x1536 or a dCRT/HDTV up to 1920x1080. Flat Panel is a fixed<br />
resolution display. The GMCH supports panel fitting in the transmitter, receiver, or an external<br />
device, but has no native panel fitting capabilities. The GMCH will, however, provide unscaled<br />
mode where the display is centered on the panel.<br />
10.6.2.1.3 LVDS Capabilities<br />
The GMCH may use the SDVO ports to drive an LVDS transmitter. Flat Panel is a fixed<br />
resolution display. The GMCH supports panel fitting in the transmitter, receiver, or an external<br />
device, but has no native panel fitting capabilities. The GMCH will, however, provide unscaled<br />
mode where the display is centered on the panel. The GMCH supports scaling in the LVDS<br />
transmitter through the SDVO stall input pair.<br />
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