External Clock

[Lee Noack]

Hi,

Does the ext clk refer to an external clock in or the clock out of the crystal. I wish to feed an external clock in to the board.

[LubOlimex]

Usually, yes, it is meant for external clock source. It is a good idea to mention which board exactly you have in mind, though.

[Lee Noack]

Ah yes. It is the ice40HX1K-EVB however the other boards have the same or similar clock cct.

Can't insert/attach cct, sorry.

[LubOlimex]

In iCE40HX1K-EVB we have already provided external clock. EXTCLK is generated by the 100Mhz oscillator CR1. Refer to this excerpt of the schematic: https://i.imgur.com/XKJaFmO.jpg