Prob in using VCD file by PowerPlay

[Altera_Forum]

Hi, 

 I am trying to estimate the dynamic power of my Nios II based system using the PowerPlay Power Analyzer tool. For this I simulated the entire system using ModelSim, following instructions similar to that given in this tutorial: http://www.altera.com/literature/an/an351.pdf (http://www.altera.com/literature/an/an351.pdf) ...   Before simulating the design, I create a vcd file using 'vcd file' command and add all the required signals to be included in the vcd file using the 'vcd add' command and then run the simulation. The VCD files is successfully generated and I have verified that it contains the value changes of all the signals that I have specified.  Now I run the PowerPlay tool, giving this VCD file as the input. But, the toggle rates of only a few signals (~2%) are read from the simulation (VCD file) and the remaining (~98% of the signals) use default 12.5% toogle rate assignment. The only signals whose toggle rates are taken from the simulation (i.e the VCD file) are the input and output signals to the Nios II processor (eg. clk, reset, signals to the sdram), although the Value changes of all the other internal signals are also present in the VCD file generated by ModelSim.  Why is this so? Why is PowerPlay not taking the toggle rates of other signals (internal signals) from the VCD file? As a result I get a 'Low' confidenc metric level in the Power Analysis Report and it says that the user has not provided sufficient toggle rate data. If you have any idea on how to make PowerPlay take all the toggle rates from the VCD file, please help me.   Thanking you in advance, Sai Prashanth