Clocks, Buttons, Switches, and Seven Segment Displays
The Cyclone II EP2C20F484C7 FPGA on the DE1 logic kit is connected to four seven segment displays, (Hex_0, Hex_1, Hex_2, and Hex_3), ten slide switches (Switch_0 through Switch_9), four push buttons (Key_0 through Key_3), ten red LEDs (Red_LED_0 through Red_LED_9), and eight green LEDs (Green_LED_0 through Green_LED_7).
The slide switches produce logic “1” when pushed away from the edge of the board, and the push buttons produce logic “0” when pressed. The segments of the seven segment displays light up when connected to logic “0,” and the LEDs light up when connected to logic “1”. The following table shows which FPGA pin numbers are connected to these devices.
The segments of a seven-segment display are normally named A–G, starting at the top, going clockwise, and ending with the center segment. The array names in the table refer to the segments using subscript values 0–6 in the same order.
To make the process of pin assignment easier, the following table is in alphabetical order, which should match the order of the pins listed by the Quartus Pin Assignment Editor, provided you name your pins and pin groups alphabetically: Clock…, Green…, Hex_0…, Hex_1…, Hex_2…, Hex_3…, Key…, Red…, and Switch… in that order.
| Connection | Pin Location |
|---|---|
| Clocks | |
| 27 MHz Clock | PIN_D12 and PIN_E12 |
| 50 MHz Clock | PIN_L1 |
| 24 MHz Clock | PIN_A12 and PIN_B12 |
| Green LEDs | |
| Green_LED_0 | PIN_U22 |
| Green_LED_1 | PIN_U21 |
| Green_LED_2 | PIN_V22 |
| Green_LED_3 | PIN_V21 |
| Green_LED_4 | PIN_W22 |
| Green_LED_5 | PIN_W21 |
| Green_LED_6 | PIN_Y22 |
| Green_LED_7 | PIN_Y21 |
| Seven-segment Displays | |
| Hex_0[0] | PIN_J2 |
| Hex_0[1] | PIN_J1 |
| Hex_0[2] | PIN_H2 |
| Hex_0[3] | PIN_H1 |
| Hex_0[4] | PIN_F2 |
| Hex_0[5] | PIN_F1 |
| Hex_0[6] | PIN_E2 |
| Hex_0, Decimal Point | No Connection |
| Hex_1[0] | PIN_E1 |
| Hex_1[1] | PIN_H6 |
| Hex_1[2] | PIN_H5 |
| Hex_1[3] | PIN_H4 |
| Hex_1[4] | PIN_G3 |
| Hex_1[5] | PIN_D2 |
| Hex_1[6] | PIN_D1 |
| Hex_1, Decimal Point | No Connection |
| Hex_2[0] | PIN_G5 |
| Hex_2[1] | PIN_G6 |
| Hex_2[2] | PIN_C2 |
| Hex_2[3] | PIN_C1 |
| Hex_2[4] | PIN_E3 |
| Hex_2[5] | PIN_E4 |
| Hex_2[6] | PIN_D3 |
| Hex_2, Decimal Point | No Connection |
| Hex_3[0] | PIN_F4 |
| Hex_3[1] | PIN_D5 |
| Hex_3[2] | PIN_D6 |
| Hex_3[3] | PIN_J4 |
| Hex_3[4] | PIN_L8 |
| Hex_3[5] | PIN_F3 |
| Hex_3[6] | PIN_D4 |
| Hex_3, Decimal Point | No Connection |
| Push Buttons | |
| Key_0 | PIN_R22 |
| Key_1 | PIN_R21 |
| Key_2 | PIN_T22 |
| Key_3 | PIN_T21 |
| Red LEDs | |
| Red_LED_0 | PIN_R20 |
| Red_LED_1 | PIN_R19 |
| Red_LED_2 | PIN_U19 |
| Red_LED_3 | PIN_Y19 |
| Red_LED_4 | PIN_T18 |
| Red_LED_5 | PIN_V19 |
| Red_LED_6 | PIN_Y18 |
| Red_LED_7 | PIN_U18 |
| Red_LED_8 | PIN_R18 |
| Red_LED_9 | PIN_R17 |
| Slide Switches | |
| Switch_0 | PIN_L22 |
| Switch_1 | PIN_L21 |
| Switch_2 | PIN_M22 |
| Switch_3 | PIN_V12 |
| Switch_4 | PIN_W12 |
| Switch_5 | PIN_U12 |
| Switch_6 | PIN_U11 |
| Switch_7 | PIN_M2 |
| Switch_8 | PIN_M1 |
| Switch_9 | PIN_L2 |