XPower: -tb switch

[Edward]

Hello, I am currently using the command line version of XPower to
estimate power consumption on my designs. A -tb <time> switch is
avialable that produces power estimates for every time interval
specified in <time>. Does it just take into account the activity rate
simply for that time interval or the activity rate so far i.e.
starting from 0s?

 

[Brendan Cullen]

Hi Edward,

Edward wrote:

Hello, I am currently using the command line version of XPower to
estimate power consumption on my designs. A -tb <time> switch is
avialable that produces power estimates for every time interval
specified in <time>. Does it just take into account the activity rate
simply for that time interval or the activity rate so far i.e.
starting from 0s?

Short answer : "so far"

Longer answer : Time based simulation file analysis can be performed any
time a VCD file is loaded. It will be performed if the file is being
loaded from the command line and the -tb switch is used, or if it is
being loaded in the Gui and the "Do Time based Simulation" box is
selected. This will read in the VCD file and for every time indication
it will record the number of transitions between this and the last and
calculate how much power has been generated for that time period. It
records the highest value, and this will be displayed as "Peak Power" in
the Summary view (Summary Tab) and in the text and html report. It
always writes out a text file recording the power for each time period.
This file can be read into Excel or other graph making utility to produce
a graph of power over time.

Brendan