AMD PCM-5820 manual VGA interface connections, CRT display connector CN18

2.16 VGA interface connections

The PCM-5820 Series board's SVGA interface can facilitates conventional CRT displays as well as active LCD displays. The card has two connectors to support these displays, one for standard CRT VGA monitors and one for flat panel displays.

2.16.1 CRT display connector (CN18)

CN18 is a 15-pin, D-SUB connector commonly used for conven- tional CRT displays.

Detailed information on pin assignments for CRT display connec- tor CN18 is given in Appendix A.

2.16.2 Flat panel display connector (CN12)

CN12 consists of a 44-pin, dual-in-line header.

The power supply (+12 V) for CN12 is dependant on the supply connected to the board. Therefore make sure that CN9 is connect- ed to a +12 V power supply.

The PCM-5820 Series provides a bias control signal on CN12 which can be used to control the LCD bias voltage. It is recom- mended that the LCD bias voltage not be applied to the panel until the logic supply voltage (+5 V or +3.3 V) and panel video signals are stable. Under normal operation the control signal (ENAVEE) is active high. When the PCM-5820 Series board's power is applied, the control signal is low until just after the relevant flat panel signals are present.

Chapter 2 Installation 25