====== 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. {{ :gecko4education_epfl:clocks.tcl |Here }} you find an example tcl script that can be used for pin-assignment in Quartus with {{ :gecko4education_epfl:clocks_sdc.tcl |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 [[:gecko4education_epfl:buttons|here]].