NEC startWARE-GHS-Ravin-E, User Manual

Page: 33 / 40

33
Chapter 5 Appendix
User’s Manual U17316EE1V0UM00
5.1.8 Select digital video signal voltage with JP3
The digital video output signals on CN13 can drive either 3.3 V LVTTL or 5 V TTL compatible devices.
JP3 selects between these two voltages.
Figure 5-9: Jumper JP3
Note: Board orientation as depicted in Figure 5-1.
5.1.9 Enable DOTCLK for VGA interface with JP4
When a jumper is plugged onto JP4, then the 5 V TTL DOTCLK is connected to pin 9 of CN12. This sig-
nal is normally not used and therefore the board is shipped without JP4. Before plugging JP4, please
make sure that your monitor can tolerate that signal. There is probably no standard monitor, which can
use the DOTCLK. We have implemented it primarily for experimenting with analogue TFT displays.
Figure 5-10: Jumper JP4
Table 5-7: Jumper Settings with JP3
Jumper setting Function
1-2 (top
Note
)
3.3 V signal output level
2-3 (bottom
Note
)
5.0 V signal output level