Clock signal for an external peripheral

Hallo, which is the best way to create a clock signal into a Spartan-3 for an external peripheral?

I have thought to use a dcm and connect clkfx_out to 1 of the 8 GCLK pin.

Any suggestion?

Many Thanks Marco

Reply to
Marco
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It doesn't really matter how you create it.. as long as its in the right phase for what you need to do... just try to avoid outputting the output of a GBUF. I think the best output is a divide of one of the system (internal)clocks.

Simon

Reply to
Simon Peacock

Sorry Simon, but I don't have understood.

Could you explain please?

Thanks Marco

Reply to
Marco

There are three things here.. what don't you understand?? They are both basic concepts

1/ GBUFs (global clock buffers) are for driving internal clock nets. 2/ if it looks like a clock then its ok... 3/ clock out = any bit of a binary divide by n counter.

What's so hard about any of those ? If you are finding English difficult.. I would suggest finding a translator :-) If you don't understand the basics of digital logic.. get a book and learn... FPGAs are no different to a PCB with its logic... only its smaller, faster and bugs are easier to fix. (mostly)

Simon

(internal)clocks.

Reply to
Simon Peacock

I have some troubles with english... sorry. Google translator is not very good.

If I have understood I must avoid using a GCLK out pin.

Instead I can use which pin I desire, right?

Clock frequency is not a trouble.

Many Thanks Marco

Reply to
Marco

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