Altera PowerPlay Early Power Estimator User Manual
Page 16
3–2
Altera
Corporation
PowerPlay Early Power Estimator For Arria GX FPGAs
May 2008
PowerPlay Early Power Estimator Inputs
describes the values that need to be specified in the Main
section of the PowerPlay Early Power Estimator.
Table 3–1. Main Section Information (Part 1 of 3)
Input Parameter
Description
Family
Select the device family.
The famiIy supported is Arria GX.
Device
Select your device.
Larger devices consume more static power and have higher clock dynamic power. All
other power components are unaffected by device.
Package
Select the package that is used.
Larger packages provide a larger cooling surface and more contact points to the
circuit board, leading to lower thermal resistance. Package selection does not affect
dynamic power.
Temperature Grade
Commercial devices have a maximum operating temperature of 85 °C. Industrial
devices offer 100 °C operation.
This field only affects maximum junction temperature.
Power Characteristics
Select typical or theoretical worst-case silicon process.
There is process variation from die-to-die. This primarily impacts the static power
consumption. Maximum is used for thermal design, while Typical provides results
that line up with average device measurements.
Junction Temp, T
J
(
o
C)
Enter the junction temperature of the device. This value can range from –40 °C to
100 °C. This field is only available when User Entered T
J
is selected.
In this case, junction temperature is not calculated based on the thermal information
provided.
Ambient Temp, T
A
(°C)
Enter the air temperature near the device. This value can range from –40 °C to
100 °C. This field is only available when you select Auto Computed T
J
.
If Estimated
θ
JA
is selected, this field is used to compute junction temperature
based on power dissipation and thermal resistances through the top-side
cooling solution (heat sink or none) and board (if applicable).
If Custom
θ
JA
is selected, this field is used to compute junction temperature
based on power dissipation and the custom
θ
JA
entered.