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Forums > Digital IC > Floorplanning, Place and route

Subject: Library preparation for the MultiVT libraries
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kulprashant05
Posts: 0
Online: User is Offline
9/20/2007 9:44 PM  
Hi,

I wanted to work on the "MultiVT" libraries in my design, can any one suggest me how to go about this ?

1. In normal flow we will just import lib files, is it same in case multvt libs? if yes then how to differentiate?

2. how to diffrentiate HVT & RVT cells in the design (ie how to calculate the % of HVT & RVT cells)

3. what will be PD Flow(physical design steps)

Please suggest.

Thanks & Regards,
kulprashant
Kari
Posts: 81
Online: User is Offline
9/25/2007 2:07 PM  
Hi Kulprashant,

You really don't have to do anything different. Just load in the .lib of both libraries. The cells should have different names, like INV and INVTH, or INV_HVT and INV_RVT, or something similar. I don't know of an automatic way to get the % of HVT vs RVT, but it should be easy to write a script to parse the netlist or a summary report file. As for the flow, it will be pretty much the same, but check the docs for setOptMode -leakagePowerEffort and set it to what you think is best for your design goals.

Hope that helps,

- Kari
ssunder@sioptical.com
Posts: 24
Online: User is Offline
10/30/2007 11:52 AM  
Along the same lines I have another query. I am trying to set up a multi vt flow as well.
For my design, I have low VT and High Vt libraries.

For setOpCond  and corner specification how do I specify multiple libraries? Currently multiple libs cannot be specified with setOpCond for max and min.

 
LVT lib is called scmetro_cmos10lp_lvt_ss_1p08_125C.lib

HVT lib is called scmetro_cmos10lp_hvt_ss_1p08_125C.lib

Operating condition in both is called ss_1p08_125C

 
Thanks and Regards,

Sanjay Sunder


 
Kari
Posts: 81
Online: User is Offline
11/05/2007 1:18 PM  
Hi Sanjay,

Just enter the setOptCond info for one library. The operating condition is the same, so it doesn't matter.

- Kari
ssunder@sioptical.com
Posts: 24
Online: User is Offline
11/06/2007 11:32 AM  
Kari -

Thanks!

Sanjay
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Forums > Digital IC > Floorplanning, Place and route > Library preparation for the MultiVT libraries


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