Altera PowerPlay Early Power Estimator User Manual

Page 34

Column Heading

Description

I/O Standard

Select the I/O standard used for the input, output, or

bidirectional pins in this module from the drop-down list.
The calculated I/O power varies based on the I/O standard.

For I/O standards that recommend termination (SSTL and

HSTL), the PowerPlay EPE spreadsheet assumes you are

using external termination resistors. If you are not using

external termination resistors, choose the LVTTL/LVCMOS

I/O standard with the same voltage and current strength as

the terminated I/O standard.
To view all the I/O standards in the drop-down list, use the

scroll bar.

Input Termination

Select the input termination (on-chip parallel termination

OCT] or on-chip differential termination [R

OCT])

setting implemented for the input and bidirectional pins in

this module.

Current Strength/ Output Termination

Select the current strength or output termination (on-chip

serial termination [R

OCT]) implemented for the output

and bidirectional pins in this module.
Current strength and output termination are mutually

exclusive.

Slew Rate

Select the slew rate setting for the output and bidirectional

pins in this module. Using a lower slew rate setting helps to

reduce switching noise but may increase delay.

Setting

Select the V

for the output and bidirectional pins in this

module. If you use a lower voltage, it helps to reduce static

power.

Pre-Emphasis Setting

Select the pre-emphasis setting for output and bidirectional

pins in this module. Disable the pre-emphasis will reduce

dynamic power.

#Input Pins

Enter the number of input pins used in this module.

Consider a differential pin pair as one pin.

#Output Pins

Enter the number of output pins used in this module.

Consider a differential pin pair as one pin.

#Bidir Pins

Enter the number of bidirectional pins used in this module.

When you enable the output enable signal, the I/O pin is

treated as an output. When you disable the output enable

signal, the I/O pin is treated as an input.
An I/O configured as bidirectional but used only as an

output consumes more power than an I/O configured as

output-only, due to the toggling of the input buffer every

time the output buffer toggles (they share a common pin).

3-24

I/O Worksheet

UG-01070

2015.01.20

Altera Corporation

PowerPlay Early Power Estimator Worksheets

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