November 15, 2019, 03:33:11 pm

External Clock

Started by Lee Noack, October 03, 2017, 08:51:24 am

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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.
Technical support and documentation manager at Olimex

Lee Noack

October 04, 2017, 02:16:32 am #2 Last Edit: October 04, 2017, 02:22:38 am by 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
Technical support and documentation manager at Olimex