Altera PowerPlay Early Power Estimator Manual do Utilizador descarregar pdf (Página 31)

Chapter 3: Using Cyclone III PowerPlay Early Power Estimator 3–19

Power Analysis

Table 3–9 describes the thermal power parameters in the PowerPlay Early Power

Estimator.

Thermal Analysis

You can choose to enter T

directly or compute T

based on information provided. If

you choose to enter T

, select User Entered T

in the Input Parameters section. If you

choose to automatically compute T

, select Auto Computed T

in the Input

Parameters section.

When computing T

value obtained, the ambient temperature of the device, airflow,

heat sink solution, and board thermal model are considered to determine the junction

temperature (T

) in °. T

is the estimated operating junction temperature based on your

device and thermal conditions.

Figure 3–13. Thermal Power in the PowerPlay Early Power Estimator

Table 3–9. Thermal Power Section Information

Parameter Description

Logic This shows the dynamic power consumed by LUTs and associated routing. For details, click Logic.

RAM This shows the dynamic power consumed by RAM blocks and associated routing. For details, click

RAM.

DSP This shows the dynamic power consumed by DSP blocks and associated routing. For details, click DSP.

I/O This shows the thermal power consumed by I/O pins and associated routing. This includes static power

dissipated in terminated I/O standards on-chip and stand-by power dissipated in I/O banks. For details,

click I/O.

PLL This shows the dynamic power consumed by PLLs. For details, click PLL.

Clocks This shows the dynamic power consumed by clock networks. For details, click Clocks.

static

This shows the static power consumed regardless of clock frequency. This does not include static I/O

current due to termination resistors, which is included in the I/O power above.

static

is affected by junction temperature, selected device, and power characteristics.

TOTAL This shows the total power dissipated as heat from the FPGA. This does not include power dissipated in

off-chip termination resistors.

For current draw from the FPGA supply rails, refer to “Power Supply Current (A)” on page 3–23. This

may differ due to currents supplied to off-chip components and thus not dissipated as heat in the FPGA.

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