Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Is metal and std cell fill required?

Status
Not open for further replies.
J

jelydonut

Full Member level 4
Joined
Dec 27, 2002
Messages
239
Helped
3
Reputation
6
Reaction score
0
Trophy points
1,296
Activity points
1,730
Is it required to perform metal and cell fill after routing?
What are the advantages/disadvantages of doing this, and when should it be considered or avoided?

jelydonut
 

Filler cells provide decoupling capacitance or complete the power connections in the standard cell rows.Fillers are added at the end of the design cycle.

Metal fill is electrically inactive metal that fills open areas on each metal layer. This serves to
minimize variations in the metal thickness, resulting in a more even distribution of the
dielectric and improved chip performance.
 

mediative is right.
----------------------------------------------------------------------------------------
>>>What are the advantages/disadvantages of doing this, and when should it be considered or avoided?

Both of them are MUST.
So instead of considering what's the "advantage" or the "disadvantage",
one should take care is how to add them efficiently.

Especially, it need to add metal fill properly to minimize the impact on timing.
 

One of the main reason for metal filling is because of process requirement. CMP(Chemical Mechanical Polishing) is now normally used for 0.5 micron and below process. This process step is to achieve planarity. Thus every fab would require a certain level of metal density to ensure Effective CMP, if your design do not have enough certain level of metal, then you are required to do filling to meet the required density.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top