Pin 35 from FPGA is an output from internal PLL (ICE_CLK), so is an input on microcontroller STM32 (as a clock?).
Why need a jumper here? What is it used for?
the MCU output 12MHz clock to iCE40 as external clock, but if you need other frequence, you can take off the jumper and connect your specified clock source.
Pin 35 from FPGA is an output from internal PLL (ICE_CLK), so is an input on microcontroller STM32 (as a clock?). Why need a jumper here? What is it used for?