PCM-9577

2.19 VGA/LCD/LVDS interface connectionsThe PCM-9577’s PCI SVGA interface can drive conventional CRT displaysand is capable of driving a wide range of flat panel displays, includingpassive LCD and active LCD displays. The board has threeconnectors to support these displays: one for standard CRT VGA monitors,one for flat panel displays, and one for LVDS type LCD panels.2.19.1 CRT display connector (CN22)CN22 is a 16-pin, dual-inline header used for conventional CRT displays.A simple one-to-one adapter can be used to match CN22 to a standard 15-pin D-SUB connector commonly used for VGA.Pin assignments for CRT display connector CN22 are detailed in AppendixC.2.19.2 Flat panel display connector (CN23)CN23 consists of a 40-pin connector which can support a 24-bit LCDpanel. It is Hirose’s product no. DF13A-40DP-1.25 VThe PCM-9577 provides a bias control signal on CN23 that can be usedto control the LCD bias voltage. It is recommended that the LCD biasvoltage 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, thecontrol signal (ENAVEE) is active high. When the PCM-9577’s power isapplied, the control signal is low until just after the relevant flat panel signalsare present. CN23 can connect up to 24 bit TFT LCD.2.19.3 Extension flat panel connector (CN18)CN18 consists of a 20-pin connector which is Hirose’s product no.DF13A-20DP-1.25V. The PCM-9577 supports a 36-bit LCD panel whichmust be connected to both the CN23 (40-pin) and the CN18 (20-pin). Thepin assignments for both CN23and the CN18 can be found in Appendix C2.19.4 LVDS LCD panel connector (CN15)The PCM-9577 uses the VIA Twister chip that supports 2 channel (2 x18 bit) LVDS LCD panel displays. Users can connect to either an 18-bitor 36-bit LVDS LCD with CN15.PCM-9577 User’s Manual 20