Altera PowerPlay Early Power Estimator - Manual (Page 50)

Power Breakout for Multiple Voltage Supplies
For V
CCIO
and V
CCPD
, the minimum current requirement reported for I
CCIO
and I
CCPD
respectively has
the same value for each voltage rail used in your design.
These values are based on all I/O pins in the device being powered by the same voltage rail, thus the
minimum current requirement is repeated for each unique voltage rail used by V
CCIO
and V
CCPD
.
To better estimate the minimum current requirements for I
CCIO
and I
CCPD
based on your device and
design usage, you can use the following equations:
• [(Number of I/O pins powered by V
CCIO
voltage) / (number of total I/O pins in the device)] ×
(Minimum supply current) × (1.10)
• [(Number of I/O pins powered by V
CCPD
voltage) / (number of total I/O pins in the device)] ×
(Minimum supply current) × (1.10)
Repeat the formula for each V
CCIO
voltage and V
CCPD
voltage used in your design. The number of I/O
pins powered by V
CCIO
and V
CCPD
voltage represents the count of both used and unused I/O pins in I/O
banks powered by a particular voltage. The minimum supply current is the value provided in the power
estimation tools for I
CCIO
and I
CCPD
.
The 1.10 scaling factor is provided as additional guardband and must be included for your power
estimation.
Power Regulator Settings
Regulator groups consist of rails that can be combined and supplied by a single regulator. A manual entry
here can move a rail from one group to another or create a new group. This may be necessary to correct
grouping errors that may occur.
Related Information
Power Tree Design on page 3-7
Enpirion Worksheet
Enpirion power devices are available to satisfy the power requirements for the power rails on Altera FPGA
devices. Power devices are selected based on load current, input and output voltages, and power-delivery
configuration.
Each row in the Regulator Selection table represents the power solution for a single power group. The
power groups are created by combining rails that can be allowably supplied from the same source.
Enpirion device selection is enabled when the Main worksheet for the Maximum Power Characteristics
and the Regulator Group section of the Report worksheet are set up correctly with no grouping errors.
In the following figure, a 12-V off-line regulator supplies input power for Groups 1 and 5. The 3-V
regulator supplying Group 5 also acts as an intermediate bus supplying input power for Groups 2, 3, and
4.
3-40 Power Breakout for Multiple Voltage Supplies
UG-01070
2015.01.20
Altera Corporation PowerPlay Early Power Estimator Worksheets
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