19 Chapter 2
Unlike floppy drives, IDE hard drives can connect to either end of the
cable. If you install two drives, you will need to set one as the master and
one as the slave by using jumpers on the drives. If you install only one
drive, set it as the master.
2.15 VGA/LCD interface connections
The PCA-6774’s display interface can drive conventional CRT displays
and is capable of driving a wide range of flat panel displays as well,
including passive LCD and active LCD displays. The board has two dis-
play connectors: one for standard CRT VGA monitors, and one for flat
panel displays.
2.15.1 CRT display connector (CN7)
CN7 is a standard 15-pin D-SUB connector commonly used for VGA.
Pin assignments for CRT display connector CN7 are detailed in Appendix
B.
2.15.2 Flat panel display connector (CN22)
CN22 consists of a 40-pin connector which can support an 18-bit LCD
panel. It is Hirose’s product no. DF13A-40DP-1.25 V.
The PCA-6774 provides a bias control signal on CN22 that can be used to
control the LCD bias voltage. It is recommended that the LCD bias volt-
age 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 PCA-6774’s power is
applied, the control signal is low until just after the relevant flat panel sig-
nals are present. CN22 can connect up to 18-bit TFT LCD
.
2.15.3 Extension flat panel connector (CN23)
CN23 consists of a 20-pin connector which is Hirose's product no. DF13-
20DP-1.25V. The PCA-6774 supports a 36-bit LCD panel which must be
connected to both the CN22 (40-pin) and CN23 (20-pin). The pin assign-
ments for both CN22 and CN23 can be found in Appendix B.
2.15.4 LVDS LCD panel connector (CN25)
The PCA-6774 uses the VIA "Twister T" chip that supports 2 channel
LVDS LCD panel displays. Users can connect to LVDS LCD with CN25.
