Common Interview Questions

[aditya1579]

One of the common interview questions I face is :

While building a clock tree, what are some of the factors one should take care of ? Skew is one of the points which comes to my mind. What are the others ?

Maybe things like - which buffers to use to get minimum delay, which layers to route the clock wires on etc. ??

Aditya

 

[Manochitra]

while building a clock tree

There are three important parameters for such nets:

***Transition time:- This is the time it takes to change the logic level of a node (e.g. 0 ! 1).

***Insertion delay:- The time required for the signal to travel from the driver to the end-points.

***Skew :- Difference in clock arrival time at two spatially distinct points