Altera DE2-115 User Manual download pdf (Page 34)

Figure 4-6 Connections between the push-button and Cyclone IV E FPGA

Pushbutton released

Pushbutton depressed

Before

Debouncing

Schmitt Trigger

Debounced

Figure 4-7 Switch debouncing

There are also 18 slide switches on the DE2-115 board (See Figure 4-8). These switches are not

debounced, and are assumed for use as level-sensitive data inputs to a circuit. Each switch is

connected directly to a pin on the Cyclone IV E FPGA. When the switch is in the DOWN position

(closest to the edge of the board), it provides a low logic level to the FPGA, and when the switch is

in the UP position it provides a high logic level.

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Altera DE2-115 User Manual Page 34