Congatec COM Express conga-B915 Instrukcja Użytkownika Pobierz pdf (Strona 9)

Embedded Computer

Computer On Module

XTX, ETX, COM Express, Qseven

Carrier board

with customized functionality

EPI

Power

Power Supply

Display

Backlight

Rotate

Flip

I²C Device

BrightnessDisplay Properties

Power Sequencing

Display Data

Display Subsystem

Embedded Panel Interface EPI

TechnologyQsevenCOM ExpressXTX / ETX

w w w.congatec.com

Embedded Panel Interface EPI

EPI Flat Panel Support

The Embedded Panel Interface EPI, an open

standard, allows for easy and direct control of all

ﬂat panel displays with maximum interchange-

ability.

One of the biggest advantages of COM‘s

(Computer On Modules) is the interchangeability

of modules between different suppliers. The only

weak point was the direct control of ﬂat panel

displays. Due to the lack of a uniform standard all

manufacturers had to deﬁne their own interface

strategy.

This problem is now solved with the use of Em-

bedded Panel Interface EPI. EPI is based on

the VESA standard EDID 1.3 and deﬁnes the

software format for display properties and the

scalable hardware interface.

With EDID 1.3 only monitors with local intelligence

can be operated. In order for an Embedded

Computer Module to have direct control of a ﬂat

panel display some more information is required.

Therefore, EPI adds the missing parameters to the

complete set of EDID 1.3 data.

An EPI data set, used to describe the control of

a ﬂat panel display, can be easily created using

the information found in the display‘s datasheet.

It‘s even easier when using congatec‘s system

utility.

With this tool the EPI data set can be created

and written to a reserved area in the congatec

embedded BIOS. The EPI data set description

is independent from the video controller and is

interpreted by the video BIOS of the COM in order

to set the correct video attributes. The result is a

manufacturer independent “plug-and-display”

solution that enables free interchangeability of

displays and COM‘s.

The congatec system utility enables users

to easily generate an EPI dataset.

Further Details: www.epi-standard.org

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