Altera Cyclone III FPGA Betriebsanweisung PDF herunterladen (Seite 23)

Altera Corporation Core Version a.b.c variable 4–1

July 2010 Preliminary

4. Measuring Power on the

Cyclone III Starter Board

Introduction

One of the main features of the Cyclone

III device is its low power

consumption. You can measure the power of the 3C25 device on the

Cyclone III starter board under various conditions with an example

design provided with the kit.

The power example design allows you to control the amount of logic

utilized in the FPGA, the clock frequency, the number of I/Os being used,

and measure the effect on the power to the Cyclone III device. Because the

Cyclone III starter board has only four buttons and four LEDs, interaction

with the board is minimal as defined below.

Table 4–1 describes the functionality of the four input buttons that control

the power example design.

Tables 4–2 and 4–3 describe how the LEDs indicate the example design’s

current power state.

Table 4–1. Four Input Button Functionality

Button FPGA Pin Type Description

1 F1 Reset Resets the demo to the beginning, node

i_nrst.

2 F2 Toggle Advances the example design to the next higher

frequency, node i_nfreq_next.

3 A10 Toggle Advances the example design to the next higher

resource utilization, node_i_nperc_next.

4 B10 Press and Hold Enables the outputs to toggle, node

i_noutput_ena.

Table 4–2. LEDs Power State (Frequency)

Displays

LEDs

State

Clock Frequency

(MHz)

MSB LSB

Frequency LED2 LED1 00 0

01 33

10 67

11 100

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 35 36

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Altera Cyclone III FPGA Betriebsanweisung Seite 23