DE2-115: User Manual
DE2-115: User Manual
DE2-115: User Manual
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Figure 4-6 Connections between the push-button and Cyclone IV E FPGA<br />
Pushbutton depressed<br />
Pushbutton released<br />
Before<br />
Debouncing<br />
Schmitt Trigger<br />
Debounced<br />
Figure 4-7 Switch debouncing<br />
There are also 18 slide switches on the <strong>DE2</strong>-<strong>115</strong> board (See Figure 4-8). These switches are not<br />
debounced, and are assumed for use as level-sensitive data inputs to a circuit. Each switch is<br />
connected directly to a pin on the Cyclone IV E FPGA. When the switch is in the DOWN position<br />
(closest to the edge of the board), it provides a low logic level to the FPGA, and when the switch is<br />
in the UP position it provides a high logic level.<br />
33