Altera Cyclone III FPGA Starter Kit - Manual (Page 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