read_saif command - help needed

[santumevce]

read_saif

Hi,

I have a doubt on read_saif command.

Lets consider an example.

I have a top module - TOP
In this top module i have three instances - A,B,C

I have simulated the top module -TOP and captured the backward saif file
Now i want to calculate the power for modules A & B

To calculate the power I have to read the backward saif file using read_saif command.

But in the read_saif command, can we give two instances?

i.e
read_saif -auto_map_names -input backward.saif -instance DUT/TOP/A -instance DUT/TOP/B

is this statement correct to read saif information of only two modules A & B ?

If not pls help me with the correct command.........


Regards,
santhosh kumar

 

[Alvin80]

Re: read_saif command help

You can annotate the activity of all the design and then you can do "report_power" only for the desired blocks.
I think that is more correct for evaluating power of a design.

 

[santumevce]

Re: read_saif command help

Hi ,

can u give me the example of how to give report_power command for desired blocks

 

[Alvin80]

Re: read_saif command help

Using Synopsys Power Compiler 2006.06, after reading the SAIF file, you need to use the command "report_power -instance $block1 > $OUTPUT_DIR/$block1.power.rpt" and "report_power -instance $block2 > $OUTPUT_DIR/$block2.power.rpt"

Obviously the design has to be hierarchical and block1 and block2 have to be sub-blocks of the top-level design 'top-block' that is simulated.

I hope that is what you are looking for.

 

[santumevce]

Re: read_saif command help

Hi Alvin,

Thanks for u comment. But I am using Prime Time. In prime time for report_power command there is no option called -instance.. For Prime Time how to calculate the power for the above stated example.

Regards
santhosh

 

[Alvin80]

Re: read_saif command help

I think that the best tool for power estimation is Power Compiler, but if you also need to do static timing analysis, you can easily use PrimeTime and the command "report_power -cell_power".
This command print the report power of all the cell in the $current_instance. You can choose the desired block (current_instance $block1) before running such command.
Maybe you can try to use "report_power -hierarchy" from the $top_instance. You'll have the power of the entire chip in a hierarchical format.

Let me know if it works or not.
I'm a newbie in this forum but it seems to be useful for designer...
I have a post because I've a problem with NCSIM... If you know that tool, please answer me...