Buttons, Switches, and LEDs
The Cyclone EP1C6Q240C8 FPGA on the UP3 Logic Kit has four “dip” switches in a block marked SW3 (SW3.1, SW3.2, SW3.3, and SW3.4), four push buttons (SW4, SW5, SW6, and SW7), and four LEDs named D4, D5, D6, and D7.
The dip switches generate logic “1” when pushed to the ON position; the push buttons generate logic “0” when pressed, and the LEDs turn on when their pins are at logic “0”. The following table shows which FPGA pin numbers are connected to these twelve devices:
The frequencies of the three clock signals depend on the configuration of some jumpers on the board. The 48 MHz clock on pin 29 is a default setting; the other two clocks have no default values.
| Connection | FPGA Pin |
|---|---|
| CLK 1: 48 MHz or 14.318 MHz | PIN_29 |
| CLK 3: 3.33 MHz or 4.318 MHz | PIN_152 |
| CPU Clock: 66 MHz or 100 MHz | PIN_153 |
| SW3.1 | PIN_58 |
| SW3.2 | PIN_59 |
| SW3.3 | PIN_60 |
| SW3.4 | PIN_61 |
| SW4 | PIN_48 |
| SW5 | PIN_49 |
| SW6 | PIN_57 |
| SW7 | PIN_62 |
| D4 | PIN_56 |
| D5 | PIN_55 |
| D6 | PIN_54 |
| D7 | PIN_53 |