User`s manual

32 PCM-5864/L User's Manual
2.18 VGA interface connections
The PCM-5864/L’s PCI SVGA interface can drive conventional
CRT displays and is capable of driving a wide range of flat panel
displays, including electroluminescent (EL), gas plasma, passive
LCD and active LCD displays. The board has two connectors to
support these displays, one for standard CRT VGA monitors and
one for flat panel displays.
2.18.1 CRT display connector (CN18)
CN18 is a 16-pin, dual-inline header used for conventional CRT
displays. A simple one-to-one adapter can be used to match CN18
to a standard 15-pin D-SUB connector commonly used for VGA.
Pin assignments for CRT display connector CN18 are detailed in
Appendix C.
2.18.2 Flat panel display connector (CN20)
CN20 consists of a 44-pin, dual-inline header which can support a
24-bit LCD panel. Power supply (+12 V) present on CN20
depends on the supply connected to the board.
The PCM-5864/L provides a bias control signal on CN20 that can
be used to control the LCD bias voltage. It is recommended 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-5864/L’s power is applied, the control
signal is low until just after the relevant flat panel signals are
present.
2.18.3 Extension flat panel connector (CN21)
The PCM-5864/L supports a 36-bit LCD panel which must be
connected to both the CN20 (44-pin) and the CN21 (16-pin). The
pin assignments for both CN20 and the CN21 can be found in
Appendix C.