Altera PowerPlay Early Power Estimator - Manual (Page 36)

3–18 Altera Corporation
PowerPlay Early Power Estimator For Stratix II, Stratix II GX & HardCopy II January 2007
PowerPlay Early Power Estimator Inputs
Figure 3–9 shows the PowerPlay Early Power Estimator spreadsheet and
the estimated power consumed by the DSP blocks in this design.
Figure 3–9. DSP Section in the PowerPlay Early Power Estimator
General I/O Pins
Stratix II, Stratix II GX, and HardCopy II devices feature programmable
I/O pins that support a wide range of industry I/O standards for
increased design flexibility. The I/O section in the PowerPlay Early Power
Estimator spreadsheet allows you to estimate the I/O pin power
consumption based on the pin’s I/O standards.
1
The PowerPlay Early Power Estimator spreadsheet assumes you
are using external termination resistors when you design with
I/O standards that recommend termination resistors (SSTL and
HSTL). If your design does not use external termination
resistors, you should choose the LVTTL I/O standard with the
same V
CCIO
and similar drive strength as the terminated I/O
standard. For example, if you are using the SSTL-2 class II I/O
standard without termination resistors (using a point-to-point
connection), you should select LVTTL/LVCMOS 2.5-V as your
I/O standard and 16mA as the Drive Strength in the PowerPlay
Early Power Estimator.
The power reported for I/O signals includes thermal and external I/O
power. The total thermal power is the sum of the thermal power
consumed by the device based on each power rail.
thermal power = thermal P
INT
+ thermal P
PD
+ thermal P
IO