Altera PowerPlay Early Power Estimator Manual de usuario descargar pdf (Pagina 29)

Altera Corporation 3–15

May 2008 PowerPlay Early Power Estimator For Arria GX FPGAs

Using the PowerPlay Early Power Estimator

Figure 3–7. DSP Section in the PowerPlay Early Power Estimator

General I/O Pins

Arria GX 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, for example:

thermal power = thermal P

INT

+ thermal P

Figure 3–8 shows a graphical representation of the I/O power

consumption. The I

CCIO

rail power includes both the thermal P

and the

external P

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Altera PowerPlay Early Power Estimator Manual de usuario Pagina 29