how to tranfer a pulse from a clock domain to another clock?

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littlefield

Joined: 07 Jul 2007
Posts: 25

20 Oct 2007 12:08 how to tranfer a pulse from a clock domain to another clock?

how to tranfer a pulse from a clock domain to another clock domain?
the frequence of both clocks are not define
and can't use fifo.

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stevepre

Joined: 10 May 2001
Posts: 92

21 Oct 2007 10:52 Re: how to tranfer a pulse from a clock domain to another cl

this is a very practical and useful logic.

Let's say, you want to transfer a pulse in clock domain A (clka) into another pulse in clock domain B (clkb).

First, you make a "toggle" signal in clock domain A. That is, whenever there is a pulse, you toggle this signal.

Second, you double sync this "toggle" signal to clkb domain, let's call the synced signal toggle_sync2.

Third, you delay it again in clock domain b, and let's called it toggle_sync3

the pulse in clock domain b will be:
toggle_sync2 ^ toggle_sync3