IEI Integration ICE-DB-T6 - Manual (Page 70)

Type 6 Carrier Board Design Guide
Page 60
3.11.1 Signal Description
Table 3-20 shows COM Express VGA signals, including pin number, signals, I/O, power
plane, terminal resistors, damping resistors and descriptions.
Pin D-SUB15 Signal I/O Description
B89 1 VGA_RED O Analog Red component of analog DAC monitor
output, designed to drive a 37.5Ω equivalent
load.
B91 2 VGA_GRN O Analog Green component of analog DAC monitor
output, designed to drive a 37.5Ω equivalent
load.
B92 3 VGA_BLU O Analog Blue component of analog DAC monitor
output, designed to drive a 37.5Ω equivalent
load.
B93 13 VGA_HSYNC O 3.3V
CMOS Horizontal sync output to VGA monitor.
B94 14 VGA_VSYNC O 3.3V
CMOS
Vertical sync output to VGA monitor.
B95 15 VGA_I2C_CK I/O 3.3V
CMOS DDC clock line (I2C port dedicated to
identify VGA monitor capabilities). DDC data
line.
B96 VGA_I2C_DAT I/O 3.3V
CMOS
DDC clock line (I2C port dedicated to
identify VGA monitor capabilities). DDC data
line.
5-8,10 GND Analog and Digital GND
9
DDC_POWER
5V DDC supply voltage for monitor
EEPROM
4,11 NC Not Connected
Table 3-20: VGA Signals Description
3.11.2 VGA Connector
Figure 3-27: VGA Connector D-SUB15
3.11.3 VGA DAC Filter
A video filter is required for each CRT DAC output. This video filter is to be placed in close
proximity to the VGA connector. The separation between each of the three video filters for
the RGB channels should be maximized if possible to minimize crosstalk.