beautypg.com

Altera Cyclone II PowerPlay Early Power Estimator User Manual

Page 47

background image

Altera Corporation

3–31

May 2006

PowerPlay Early Power Estimator User Guide For Cyclone II FPGAs

Using the Cyclone II PowerPlay Early Power Estimator

Table 3–11

describes the parameters in the Power Supply Current

parameters of the PowerPlay Early Power Estimator spreadsheet.

Table 3–11. Power Supply Current Information

Column Heading

Description

I

CC

INT

This shows the total current drawn from the I

CCINT

supply (in A).

I

CC

IO

This shows the total current drawn from the I

CCIO

power rail(s). See the I/O sheet for

details on the current drawn from each I/O rail.

I

C C I O

includes any current drawn through the I/O into off-chip termination resistors.

This can result in I

C C I O

values that are higher than the reported I/O thermal power,

since this off-chip current is dissipated as heat elsewhere and does not factor into the
calculation of device temperature.