Mailinglist Archive: radeonhd (436 mails)

["Bridgman, John" <John.Bridgman@xxxxxxx>]

> > I can do that next time I'm back home in two weeks.  For my education,
what is a TMDS, and hwat is TMDSA/LVTMA ? 

TMDS (Transition Minimized Differential Signalling, I think) is the
standard used to carry video and audio on a DVI or HDMI connector. 

LVDS is a similar (but different) standard used to drive the panel in
most laptops.

The TMDSA block is one of the encoder blocks in an ATI/AMD graphics chip
which can drive one dual-link or two single-link TMDS outputs, depending
on how it is configured. IIRC the "two single-link outputs" option is
only available on 6xx and up. 

The LVTMA block is a different encoder block on the same chip which can
drive either an LVDS output or a TMDS output. The name comes from LVds +
TMds.

The other common encoder is a DAC (Digital to Analog Converter), used to
drive analog outputs.

One of the functions of the BIOS is to tell the driver how these
different outputs are wired to connectors. Egbert was explaining that
some of the connection information in the BIOS seemed not to match your
description of the card, and in some cases did not even seem to make
sense intuitively, eg. connecting the DAC (an analog output) to an HDMI
connector (which only handles digital signals). 

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