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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 th 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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