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jitendravlsi
Joined: 21 Jul 2008
Posts: 22
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 01 Jul 2009 17:25 Metal layer constraining |
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Hi All!
In my design 1 macro block is of 5 Layer Metal. But my Tool Cadence Soc encounter supports 8 Layer Metal.
As I know I have to continue with 5+2(Power Routing Layers)=7LM for my design.
Can I continue with 5 Layer Metal for my entire design?
Please suggest the proper solution w.r.t entire flow of the design.
As we know the lesser the no. of metals the lesser is the manufacturing cost.
Thanks in advance
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jitendravlsi
Joined: 21 Jul 2008
Posts: 22
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02 Jul 2009 12:02 Re: Metal layer constraining |
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| somebody reply please ............
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techno*
Joined: 04 Jul 2009
Posts: 1
Location: bangalore
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04 Jul 2009 6:11 Re: Metal layer constraining |
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| Yes..it's possible...may be...depend on the net flow..first u try 5layers..then u try if need more layers depended on the traffic...(net congession)...there was an opntions in SoC encounter...best of luck...
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Google
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04 Jul 2009 6:11 Ads |
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vlsiblueray
Joined: 09 Jan 2009
Posts: 7
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04 Jul 2009 6:27 Re: Metal layer constraining |
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As my little bit (blind) of knowledge...i will try..to...give...small solution...
u r Macro designed by 5 Layers ....that macro u r placing in core area.....that's..ok...
After u Routing using 1P6M or 1P8M....that will be Routing on that specific Macro area ..it's taking only required metals....don't bodther abt that...u may try pre-routing...using ..different level's of metal's....as 3,5,8...Options are available..in SoC Design....Depend on the Complexity/Congessions...of the Net/Routing...Report....u may decide...howmeny Layers...may be comfort...
Bye....
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dildar
Joined: 24 Apr 2008
Posts: 1
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04 Jul 2009 6:30 Re: Metal layer constraining |
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Hi Jittu,
We can route the design by constraing the metal layers in soc encounter.
if you have design which requires only 5 metals to route comfortably without any congession then we can use only 5 layers. the following commands will help in constraing that.
set top_preferred_routing_layer = 5
set bottom_preferred_routing_layer = 1
the meaning is tool will use metals from M1,M2,M3,M4,M5 for routing.
let me know if u have any doubt regarding this.
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