Altera PowerPlay Early Power Estimator User Manual
Page 29
Column Heading
Description
Port B–R/W %
For RAM blocks in true dual-port mode, enter the average percentage
of time Port B of the RAM block is in write mode versus read mode.
For RAM blocks in simple dual-port mode, enter the percentage of
time Port B of the RAM block is reading. You cannot write to Port B in
simple dual-port mode. Port B is ignored for RAM blocks in ROM or
single-port mode or when the chosen RAM type is MLAB.
This value must be a percentage number between 0 and 100%. The
default value is 50%.
Toggle%
The average percentage for how often each block output signal changes
value on each clock cycle is multiplied by the clock frequency and
enables the percentage to determine the number of transitions per
second. This only affects routing power.
50% corresponds to a randomly changing signal. A random signal
changes states only half the time.
Suggested FF Usage
Displays the number of flipflops that you require to make the MLAB
function correctly. The MLAB power in the RAM worksheet does not
include the power of the flipflops.
If you enter the device resources manually, add the suggested number
of flipflops to the Logic worksheet using the same clock frequency.
If you have imported the device resources from the PowerPlay EPE file,
no action is required.
This field is only valid when the chosen RAM type is MLAB.
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.
For detailed analysis based on your design’s routing, use the Quartus II
PowerPlay Power Analyzer. This value is automatically calculated.
Thermal Power (W)–Block
This shows the power dissipation due to internal toggling of the RAM
(in watts).
For accurate analysis based on your design’s exact RAM modes, use the
Quartus II PowerPlay Power Analyzer. 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 RAM 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 RAM block configurations of the supported device families, refer to the
“Memory Blocks” chapter of the respective device handbook.
UG-01070
2015.01.20
RAM Worksheet
3-19
PowerPlay Early Power Estimator Worksheets
Altera Corporation