Clock sources information
The GECKO4-Education board provides two clock oscillators and 5 push-buttons that are connected to clock-inputs of the FPGA.
Xtal-oscillators
There are two Crystal oscillators mounted on the board, one provides a frequency of 12MHz, and the other a frequency of 50MHz. The FPGA-pin connection is shown in the table below. Here you find an example tcl script that can be used for pin-assignment in Quartus with here the corresponding sdc file.
| Clock | FPGA-pin | Clock | FPGA-pin |
|---|---|---|---|
| 12MHz | PIN_T22 | 50MHz | PIN_T1 |
Push-buttons
Information on the push-buttons can be found here.