Fanin andf fanout cone

[santoshl]

Can any body help me to know abt FANIN and FANOUT cone.

where is it going to play its role?


Thanks

 

[Thinkie]

If you want to know what signals affect what other signals...

It is also used in formal verification

 

[santoshl]

thanx thinke

but explain fanin n fanout cone in detail plz

 

[deh_fuhrer]

but explain fanin n fanout cone in detail plz

Read the user guide of Formality (Formal verification tool from synopsys)....

 

[avimit]

In digital design, if you take a net or port or pin, there would be a logic cloud driving it, which is called its FANIN cone, and there would be one or more other nets/pins/ports which it will drive. A collection of all those, which a perticualar port/pin/net is driving is called its FANOUT cone.
As an example a D input of a FF in digital design, is point, which would have a FANIN cone, and a Q output of a FF in digital design is a point which will have a FANOUT cone.
A FANIN cone will consist of all signals which D is depending upon
A FANOUT cone will consist of all signals which depend upon Q.
Hope it helps.
If you are asking it in relatation to formality, you may find this site useful:
http://www.vlsiip.com/formality
Kr,
Avi
http://www.vlsiip.com