Kontron SMARC Evaluation Carrier - Manual (Page 37)

User’s Guide
37 www.kontron.com
10 KLAS (Kontron LVDS Adapter System) Connections
The Evaluation Carrier features two Kontron LVDS Adapter System mezzanine boards: one for the Module LVDS, and one
for the LVDS path that is created on the Evaluation Carrier from the Module parallel LCD bus. This later LVDS path is
referred to as the “Carrier LVDS”.
The purpose of the KLAS boards is to allow adaptation of the Evaluation Carrier LVDS interfaces to various displays that
is mechanically robust and electrically preserves excellent signal integrity. Modern LVDS displays come with various
connector interfaces, including more than a few that use very fine pitch FFC (Flat Flexible Cables). The only good way to
interface to displays with FFC connections is to have the correct mating connector for the FFC on the source board.
Other displays use various discrete wire connectors. In order to not lock the Evaluation Carrier down to a single LVDS
display, the KLAS concept was developed. KLAS is a small transition board that is mounted to the Evaluation Carrier.
The KLAS transition board mounts to the Evaluation Carrier and has a display specific connector on it. It may also have
an EDID EEPROM and display –specific strap options on board.
KLAS boards come in two sizes: 34mm x 18mm and 43mm x 18mm. The larger size allows for larger (usually discrete
wire) display connectors, and also makes it easier to fit in an EDID EEPROM. The two sizes have a common hole pattern
for M2.5 mounting hardware. The two KLAS board sizes are illustrated in the two figures on the following pages.
Designers should plan for the larger KLAS size, and then the smaller one will always fit as well.
The following figure shows some images of a typical KLAS board. This one is a 34mm x 18mm board with a connector for
a 0.3mm pitch FFC for a Hyundai flat panel, evident in the right hand image. The bottom of the KLAS board is shown in
the image at left. This connector mates with the Evaluation Carrier.
Figure 7. KLAS Board 34mm x 18mm
A slightly larger format KLAS board is shown in the image below. The board is extended to the right, relative to the
smaller KLAS board, allowing room for larger display connectors. There is also room for an EDID serial EEPROM. The
mounting holes are compatible between the two KLAS board sizes. Some of the various passives set certain display
specific straps – for example, on the display used with this particular KLAS board allows the display image to be rotated
180 degrees, depending on a display pin strap. The KLAS board can be configured to take advantage of that feature.