Kontron COMe Starterkit Eval T2 - Manual (Page 101)

COM Express Interfaces
2.13. VGA
2.13.1. Signal Definitions
The COM Express Specification defines an analog VGA RGB interface for all Module types,
except type 10. The interface consists of three analog color signals (Red, Green, Blue); digital
Horizontal and Vertical Sync signals as well as a dedicated I2C bus for Display Data Control
(DDC) implementation for monitor capability identification. The corresponding signals can be
found on the COM Express Module connector row B.
Table 32: VGA Signal Description
Signal Pin HDSUB15 Description I/O Comment
VGA_RED B89 1 Red component of analog DAC monitor
output, designed to drive a 37.5Ω equivalent
load. O Analog Analog output
VGA_GRN B91 2 Green component of analog DAC monitor
output, designed to drive a 37.5Ω equivalent
load. O Analog Analog output
VGA_BLU B92 3 Blue component of analog DAC monitor
output, designed to drive a 37.5Ω equivalent
load. O Analog Analog output
VGA_HSYNC B93 13 Horizontal sync output to VGA monitor. O 3.3V CMOS
VGA_VSYNC B94 14 Vertical sync output to VGA monitor. O 3.3V CMOS
VGA_I2C_CK B95 15 DDC clock line (I2C port dedicated to identify
VGA monitor capabilities). O 3.3V CMOS Level shifter
might be
necessary
VGA_I2C_DAT B96 12 DDC data line. I/O 3.3V CMOS Level shifter
might be
necessary
GND 5..8, 10 Analog and Digital GND
DDC_POWER 9 5V DDC supply voltage for monitor EEPROM Power
N.C. 4, 11 Not Connected
2.13.2. VGA Connector
Figure 36: Female VGA Connector HDSUB15 for Carrier Board
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
101/218
11 15
6 10
1 5