Iei-integration ICE-DB-T6 Uživatelský manuál stáhnout pdf (Strana 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

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.

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