Re: [oc] interfacing 16Mhz and I Mhz clock registers

["H. Peter Anvin" <hpa@zytor.com>]

Umair Farooq Siddiqi wrote:
> Hi
> 
> I am interfacing two 16-bit wide registers, one running at 16 Mhz to
> another register running at 1 Mhz. On 16 Mhz side though the clock is at
> 16 Mhz but data only changes after 16 clocks, hence I am thinking of
> directly connecting both clock frequency registers. Would you kindly
> suggest me whether my approach is correct or not? Is there any special
> care required to meet setup and hold timings ?
> 

That should be OK if the two clocks are generated from a common source
(i.e. your 1 MHz clock is generated by dividing down the 16 MHz clock).
 Otherwise you may want to have an extra buffer register in between.

	-hpa


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