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Subject: how to reduce power dissipation in deep submicron....
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mahecadence
Posts: 19
Online: User is Offline
11/20/2007 9:27 PM  
Hi all,

please can anybody give me information about power analysis in the deep submicron technology.
lukelang
Posts: 18
Online: User is Offline
11/20/2007 9:45 PM  
Can you be a bit more specific? What do you mean by "power analysis"? Are you looking for different power reduction techniques, power estimation, etc?

Luke
mahecadence
Posts: 19
Online: User is Offline
11/20/2007 11:22 PM  
Hi lukelang,

Yes i want to know the power estimation strategy. Please can you clarify this.

Many thanks in advance.
lukelang
Posts: 18
Online: User is Offline
11/21/2007 12:19 AM  
RC (RTL Compiler) can estimate power with RTL or synthesized netlist. You can use estimated switching activity or actual switching activity (from VCD, TCF, or SAIF files). In the CPF file, you will specify the power domains (on and off) and supply voltage(s) (which library to use). And yes, you can have different voltages for different blocks. This is known as MSV (Multiple Supply Voltage).

For what-if analysis, you can code up different CPF files for different power architectures. This will help you determine the optimum power architecture very easily and quickly.

Since power, timing, and area are all related, RC has the synthesis engine to give you an accurate estimate of all three parameters in one run. After all, it doesn't matter how good the power estimate is if you can't meet timing or exceed your die size.

You should take a look at Brad Miller's excellent power estimation article at http://www.eetimes.com/news/design/showArticle.jhtml?articleID=201805258 . Please reply if you have any questions.

Luke
mahecadence
Posts: 19
Online: User is Offline
11/21/2007 2:25 AM  
First of all Many thanks lukelang.

Adding to this i want to know the generalized concept ( if possible any algorithm )for this power reduction in Deep Submicron Technology (not just related to any EDA tool).

Please can you help me in this.
lukelang
Posts: 18
Online: User is Offline
11/27/2007 11:03 PM  
If you look inside the .lib file and search for the word "power", you will find parameters for leakage and dynamic power.

For leakage power, it could be a constant value or a state dependent value. If it is state dependent, then you need to figure out the percentage of time a cell is in each state and ratio the leakage power accordingly.

For dynamic power, there are lookup tables that determine the power parameters. You provide the toggle frequency and capacitance loading, and RC calculates the power for you. I don't know the algorithm or formula for this calculation.but it is very tedious. You probably don't want to do this by hand.

Luke
mahecadence
Posts: 19
Online: User is Offline
11/28/2007 1:22 AM  
Thanks Luke,
The info that you are given is very helpful to me.

Please can you send me the document or pdf regarding RC Extraction and its relation with Fire & Ice tool.

thanks in advance.
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Forums > Special Topics > Low power > how to reduce power dissipation in deep submicron....


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