Altera PowerPlay Early Power Estimator User Manual
Page 31
Column Heading
Description
Clock Freq (MHz)
Enter the clock frequency for the module in MHz. This value is limited
by the maximum frequency specification for the device family.
Toggle %
Enter the average percentage of DSP data outputs toggling on each
clock cycle. The toggle percentage ranges from 0 to 50%. The default
value is 12.5%. For a more conservative power estimate, use a higher
toggle percentage.
In addition, 50% corresponds to a randomly changing signal (because
half the time the signal changes from a 0-to-0 or 1-to-1). This is
considered the highest meaningful toggle rate for a DSP block.
Reg Inputs?
Select whether the inputs of the dedicated DSP block or multiplier
block are registered using the dedicated input registers. If you use the
dedicated input registers in the DSP or multiplier block, select Yes. If
the inputs are unregistered or registered using registers in the ALMs or
the look-up table (LUTs), select No.
Reg Outputs?
Select whether the outputs of the dedicated DSP block or multiplier
block are registered using the dedicated input registers. If you use the
dedicated output registers in the DSP or multiplier block, select Yes. If
the inputs are unregistered or registered using registers in ALMs or
LUTs, select No.
Pipelined?
Select whether or not the dedicated DSP block is pipelined.
Thermal Power (W)–Routing
This shows the power dissipation due to estimated routing (in watts).
Routing power depends on placement and routing, which is a function
of design complexity. The values shown represent the routing power
based on experimentation of more than 100 designs.
Thermal Power (W)–Block
This shows the estimated power consumed by the DSP blocks (in
watts). This value is automatically calculated.
Thermal Power (W)–Total
This shows the estimated power (in watts), based on your inputs. It is
the total power consumed by the DSP blocks and is equal to the
routing power and block power. This value is automatically calculated.
User Comments
Enter any comments. This is an optional entry.
For more information about the DSP block configurations of the supported device families, refer to the
“DSP Blocks”, “Variable Precision DSP Blocks”, or “Embedded Multipliers” chapter of the respective
device handbook.
UG-01070
2015.01.20
DSP Worksheet
3-21
PowerPlay Early Power Estimator Worksheets
Altera Corporation