synchr.and asynchr.

Hi,

I have a question about synchr.and asynchr. systems.which one is
prefered and why?
I mean which one is recomended : 1)at every positive edge of clock we
check the reset or 2)we can reset at any time not necessarily at
posedge.

If you give me a link to know more it will be very helpful.
Thanks

 

[daytripper]

On 23 Apr 2006 08:09:18 -0700, maryam.darvishan@gmail.com wrote:

Hi,

I have a question about synchr.and asynchr. systems.which one is
prefered and why?
I mean which one is recomended : 1)at every positive edge of clock we
check the reset or 2)we can reset at any time not necessarily at
posedge.

If you give me a link to know more it will be very helpful.
Thanks

Enter reset asynchronously.
Exit rest synchronously.