Technical Manual "Thunderbird/MM” Version 1.2
12.08.2005
Page 15 of 48
1.20 DVI
Digital Visual Interface is the interface specified by the DDWG (Digital Display Working
Group) DVI Spec. Rev. 1.0 utilizing only the Silicon Image developed TMDS protocol.
1.21 DVO
The DVO B/C interface is compliant with the DVI Specification 1.0.
The DVO ports are connected to an external display device. Examples of this are TV-out encoders,
external DAC's, 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 GMCH provides two DVO ports that are each capable of driving a 165-MHz pixel clock at the
DVO B or DVO C interface. When DVO B and DVO C are combined into a single DVO port, then an
effective pixel rate of 330 MHz can be achieved. The DVO B/C ports can be driven by Pipe A or
Pipe B. If driven on Pipe B, then the LVDS port must be disabled.
1.22 LVDS
The Intel 855GME GMCH has an integrated dual channel LFP Transmitter interface to support
LVDS LCD panel resolutions up to UXGA with center and down spread SSC support of 0.5%, 1%,
and 2.5% utilizing an external SSC clock. The display pipe provides panel up-scaling to fit a smaller
source image onto a specific native panel size, as well as provides panning and centering support.
The LVDS port is only supported on Pipe B. The LVDS port can only be driven by Pipe B, either
independent or simultaneous with the Analog Display port, respectively.
The dedicated Dual Channel LFP LVDS interface with frequency range of 25 MHz to 112 MHz
(single channel/dual channel) support up to UXGA (1600 × 1200 at 60 Hz) LCD panel resolution with
maximum pixel format of 24-bpp.
There is a connector on-board to supply the LC-Display's inverter.
1.23 Fast Ethernet (Intel PRO/100)
The ICH4 LAN solution that the 82562ET/EM enables is a 32-bit PCI device that features enhanced
scatter-gather bus mastering capabilities, which allows the LAN solution to perform high-speed data
transfers over the PCI bus. The bus mastering capabilities enable the LAN solution to process high-
level commands and perform multiple operations, thereby offloading communications tasks from the
system CPU. Two large transmit and receive FIFOs are also included in the architecture to enhance
performance while minimizing the use of system resources.
The PHY unit (i82562ET/EM) supports Auto-Negotiation for 10BaseT-/100BaseTX Half Duplex and
10BaseT-/100BaseTX Full Duplex.
1.24 Audio
The Thunderbird/MM features a six channel audio system with an ALC650 CODEC (Realtek).
The ALC650 is an 18-bit, full duplex AC97 2.2 compatible stereo audio CODEC designed for PC
multimedia systems.
This CODEC also supports an AC’97 2.2 compliant SPDIF out function which allows easy
connection from the PC to consumer electronic products, such as AC3 decoder/speaker and mini
disk.
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LIPPERT
Automationstechnik GmbH • Hans-Thoma-Str. 11 • 68163 Mannheim • Tel: 0621/43214-0 • Fax: 0621/43214-30