Altera PowerPlay Early Power Estimator - Manual (Page 31)

Altera Corporation 3–13
January 2007 PowerPlay Early Power Estimator For Stratix II, Stratix II GX & HardCopy II
Using the PowerPlay Early Power Estimator
Port B – R/W % For RAM blocks in true dual-port mode, enter the average percentage of time port
B of the RAM block is in write mode versus read mode. For RAM blocks in simple
dual-port mode, enter the percentage of time port B of the RAM block is reading.
You cannot write to port B in simple dual-port mode. Port B is ignored for RAM
blocks in ROM or single-port mode.
This value must be a percentage number between 0% and 100%. The default is
50%.
Toggle% The average percentage of clock cycles that each block output signal changes
value. Multiplied by clock frequency to determine the number of transitions per
second. This value only affects routing power.
50% corresponds to a randomly changing signal. A random signal changes states
only half the time.
Valid Width/Mode This check fails if the entered data width or RAM mode is not compatible with the
selected RAM type. M512s do not support true dual-port mode and M-RAMs do not
support ROM mode. See the description of the data width column for the range of
available widths for each RAM type.
Routing This shows the power dissipation due to estimated routing (in W).
Routing power is highly dependent on placement and routing, which is itself a
function of design complexity. The values shown are representative of routing
power based on experimentation on over 100 customer designs.
Use the Quartus II PowerPlay Power Analyzer for detailed analysis based on the
routing used in your design. This value is calculated automatically.
Block This shows the power dissipation due to internal toggling of the RAM (in W).
Use the Quartus II PowerPlay Power Analyzer for accurate analysis based on the
exact RAM modes in your design. This value is calculated automatically.
Total This shows the estimated power in W, based on the inputs you entered. It is the
total power consumed by RAM blocks and is equal to the routing power and the
block power. This value is calculated automatically.
User Comments Enter any comments. This is an optional entry.
Table 3–3. RAM Section Information (Part 3 of 3)
Column Heading Description