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ravi_meghadri
Joined: 03 Aug 2007
Posts: 15
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 11 Mar 2008 15:49 I/O and power pads in floorplanning |
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Hello frnds! I have few doubts on libraries
what is the extension for I/O and power pad library? what information does it contains? to do floorplanning, what all are the libraries we need? I posted the same doubt few days back, but looking for more elaboreted reply
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rjainv
Joined: 18 Feb 2007
Posts: 147
Helped: 14
Location: Bangalore, India
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| 11 Mar 2008 16:16 I/O and power pads in floorplanning |
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which flow are you using ? I mean magma/synopsys/cadence ?
Each vendor has its own library format and hence extenstion, as well as contents.
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ravi_meghadri
Joined: 03 Aug 2007
Posts: 15
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| 12 Mar 2008 5:05 Re: I/O and power pads in floorplanning |
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| I am using synopsys flow
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rjainv
Joined: 18 Feb 2007
Posts: 147
Helped: 14
Location: Bangalore, India
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| 12 Mar 2008 5:11 I/O and power pads in floorplanning |
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| Look for *.lef
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snr_vlsi
Joined: 21 Jan 2008
Posts: 35
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| 17 Mar 2008 12:01 Re: I/O and power pads in floorplanning |
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Hi,
Each design has IO Libraries apart from technology libraries.
Thus, for Cadence and Synopsys tool you can find IO.lef file mentioned. This file actually contains the physical information about the IO pads such as the metal layers, pitch, width, height, and obstructions.
In the same way if it is a power pad, you can find in the .library the power values such as current density and other power values.
These info. is very helpful in building a power mesh for the design.
thx
snr_vlsi
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