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DE2-115: User Manual

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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 />

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