RAM 4.5 BUX II Series Bedienungsanleitung PDF herunterladen (Seite 29)

DE1 User Manual

There are 27 user-controllable LEDs on the DE1 board. Eighteen red LEDs are situated above the

18 toggle switches, and eight green LEDs are found above the pushbutton switches (the 9

green

LED is in the middle of the 7-segment displays). Each LED is driven directly by a pin on the

Cyclone II FPGA; driving its associated pin to a high logic level turns the LED on, and driving the

pin low turns it off. A schematic diagram that shows the pushbutton and toggle switches is given in

Figure 4.4. A schematic diagram that shows the LED circuitry appears in Figure 4.5.

A list of the pin names on the Cyclone II FPGA that are connected to the toggle switches is given in

Table 4.1. Similarly, the pins used to connect to the pushbutton switches and LEDs are displayed in

Tables 4.2 and 4.3, respectively.

Figure 4.4. Schematic diagram of the pushbutton and toggle switches.

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RAM 4.5 BUX II Series Bedienungsanleitung Seite 29