Altera Cyclone II PowerPlay Early Power Estimator Bedienungsanleitung PDF herunterladen (Seite 28)

3–12 Altera Corporation

PowerPlay Early Power Estimator User Guide For Cyclone II FPGAs May 2006

PowerPlay Early Power Estimator Spreadsheet Inputs

Table 3–4 describes the values that need to be entered in the Multiplier

section of the PowerPlay Early Power Estimator spreadsheet.

Figure 3–9 shows the Cyclone II device PowerPlay Early Power Estimator

spreadsheet and the estimated power consumed by the multiplier blocks

in this design.

Table 3–4. Multiplier Section Information

Column Heading Description

Module Enter a name for the embedded multiplier module in this column. This is an optional

value.

Configuration Select the multiplier block configuration. Cyclone II embedded multiplier blocks

offer the following configurations:

● 9 × 9 multiplier

● 18 × 18 multiplier

Clock Freq Enter the clock frequency for the module in MHz. This value is limited by the

maximum frequency specification for the device family.

# of Instances Enter the number of instances that have the same configuration, clock frequency,

toggle percentage and register usage. This value is independent of the number of

multiplier blocks being used.

Toggle % Enter the average percentage of the multiplier block data outputs toggling on each

clock cycle. The toggle percentage ranges from 0 to 50%. Typically the toggle

percentage is 12.5%. For a more conservative power estimate, you can use a

higher toggle percentage.

Reg Inputs? Select whether the input to the multiplier block is registered using the dedicated

input registers. If the dedicated input registers in the multiplier block are being used,

select Yes. If the inputs are registered using registers in LEs, then select No.

Reg Outputs? Select whether the input to the multiplier block is registered using the dedicated

output registers. If the dedicated output registers in the multiplier block are being

used, select Yes. If the outputs are registered using registers in LEs, then select

No.

Thermal Power (W),

Routing

This shows the estimated power consumed by the routing in W. This value is

calculated automatically.

Thermal Power (W), Block This shows the estimated power consumed by the multipliers in W. This value is

calculated automatically.

Thermal Power (W), Total This shows the estimated power in W, based on the inputs you entered. It is the total

power consumed by multiplier blocks and is equal to the routing power and the

block power. This value is calculated automatically.

User Comments Enter any comments. This is an optional entry.

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Altera Cyclone II PowerPlay Early Power Estimator Bedienungsanleitung Seite 28