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Clarification about how to create the VCD files with Modelsim

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javierh.santiago

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I know that I have to use the netlist in PrimeTime Px for power estimation, but Do I need to use the netlist file in Modelsim to generate the VCD file, or the original code (given to DesignCompiler) is enough? I try both methods, and definitively the simulation with the original code is much faster but not sure if this way is completely wrong or if it is just a poor estimation.

-Francisco
 

I am assuming by the original code, you mean RTL code. In order to accurately run the power simulation, you need netlist and VCD file.

javierh.santiago said:
I know that I have to use the netlist in PrimeTime Px for power estimation, but Do I need to use the netlist file in Modelsim to generate the VCD file, or the original code (given to DesignCompiler) is enough? I try both methods, and definitively the simulation with the original code is much faster but not sure if this way is completely wrong or if it is just a poor estimation.

-Francisco
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ebuddy said:
I am assuming by the original code, you mean RTL code. In order to accurately run the power simulation, you need netlist and VCD file.
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Yes, I meant RTL code. But, My questions which code (RTL or netlist) I need to generate the VCD file?

-Francisco
 

You need to generate VCD from your gate-level sim, that is VCD from netlist simulation

javierh.santiago said:
Yes, I meant RTL code. But, My questions which code (RTL or netlist) I need to generate the VCD file?

-Francisco
Click to expand...
 

javierh.santiago said:
I know that I have to use the netlist in PrimeTime Px for power estimation, but Do I need to use the netlist file in Modelsim to generate the VCD file, or the original code (given to DesignCompiler) is enough? I try both methods, and definitively the simulation with the original code is much faster but not sure if this way is completely wrong or if it is just a poor estimation.

-Francisco
Click to expand...

it's a poor estimation as it only assigns toggle rates to the primary inputs and maybe flops of your design. you need a vcd from the gate level sim to estimate power more accurately.
 
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