![background image](http://html1.mh-extra.com/html/embedian/smarc-t335-series/smarc-t335-series_hardware-design-manual_2399477063.webp)
SMARC T335x Carrier Board Hardware Design Guide, Document Revision 1.2
2.4.5. Carrier Based 18 bit Color Depth LVDS
LVDS LCD operation is not native to the TI Sitara AM335x. In most cases,
18bit and 24 bit color mappings are not compatible. For 24 bit color mapping,
the more common one, sometimes referred to as “24 bit standard color
mapping” is not compatible with 18 bit panels, as it places the most
significant RGB color data on the 4th LVDS data pair - the pair that is not
used on 18 bit panels.
To offer users more flexibility to use 18-bit or 24-bit LVDS panels, the LVDS
output is created on the carrier from the Sitara 24 bit LCD parallel data path.
For single channel LVDS, a display resolution up to 1280 x 1024 pixels may
be supported. Because TI AM335x SOC can support LCD resolutions up to
1366x768@60fps, 24bpp, this module does not support high resolution dual
channel LVDS displays (higher than 1366x768@60fps, 24bpp).
This section mainly focuses on carrier based 18 bit color depth LVDS from
the Module parallel data path. For 24 bit color depth LVDS, it will be detailed
in the next section.
For flat panel use, parallel LCD data and control information (Red, Green
and Blue color data, Display Enable, Vertical Synch and Horizontal Synch)
are serialized onto a set of LVDS differential pairs. The information is packed
into frames that are 7 bits long. For 18 bit color depths, the data and control
information utilize three LVDS channels (18 data bits + 3 control bits = 21
bits; hence 3 channels with 7 bit frames) plus a clock pair.