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Measuring Power on the Cyclone III Starter Board
1
To obtain the power (P) in milliwatts, measure < Measured
Voltage > (the voltage across the sense resistors at JP6 or JP3) in
mV and calculate the nominal power using the equation:
P = 100 x < Measured Voltage > x < Supply Voltage >
where < Supply Voltage > is 1.2 V for JP6 and 2.5 V for JP3.
You can use the four input buttons to advance through the various power
state as outlined in Table 4–2 . Notice how current increases as frequency
and resource usage increase.
You can also measure the I/O power consumed by measuring the voltage
across sense-resistor JP3 when Button 4 is pressed and held. Because this
2.5-V power rail is shared with other devices, there is a nominal 100 mW
that must be subtracted from the calculated I/O power to obtain the
FPGA I/O power.
The number of I/O pins used is controlled by the resource state (shown
in Tables 4–2 and 4–3 ). For each increment in resources, 16 additional I/O
pins are added (refer to Table 4–4 ).
Table 4–4. I/O Pin & Resource State
LED4/LED3
00
01
10
11
Number of I/O Pins
16
32
48
64
Similarly, the toggle-frequency of these I/O pins is set by the overall
design frequency (refer to Table 4–1 ).
Changing the Example Design
The source code for the Cyclone III power example design is also
provided so you can use it as a starting point for your own measurements.
You can adjust the number of outputs by changing parameter
NUM_OUTPUTS_PER_STAMP . The default is 16, which for four resource
percentage steps equates to 16 x 4 = 64.
The appropriate pins to be used as outputs are pre-assigned to the HSMC
connector (J1). If you would like to look at more than the 76 I/Os available
on J1, you need to make the appropriate pin assignments.
Altera Corporation
4–3
July 2010
Cyclone III FPGA Starter Kit User Guide
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相关PDF资料
DK-NIOS-2C35N NIOS II KIT W/CYCLONE II EP2C35N
DK-NIOS-2S60N NIOS II KIT W/STRATIX II EP2S60N
DK-PCI-2C35N PCI KIT W/CYCLONE II EP2C35N
DK-PCIE-2SGX90N PCIE KIT W/S II GX EP2SGX90N
DK-SI-2SGX90N SI KIT W/SII GX EP2SGX90N
DK-SI-4SGX230N KIT DEV STRATIX IV 4SGX230N/C2
DK-START-3C25N KIT STARTER CYCLONE III EP3C25
DK-START-4CGX15N KIT STARTER CYCLONE IV GX
相关代理商/技术参数
DK-N2EVAL-3C25N/QP 制造商:Altera Corporation 功能描述:
DK-N2EVAL-3C25N-OJ 制造商:Altera 功能描述:DK-N2EVAL-3C25N-OJ
DK-N55224 制造商:Brother 功能描述:
DKN7900P-4-AA-1 制造商:DEUTSCH FAST / HUCK 功能描述:
DKNIL12VF 制造商:PANASONIC 制造商全称:Panasonic Semiconductor 功能描述:10 A MINIATURE POWER RELAY
DKNIL12VNIL 制造商:PANASONIC 制造商全称:Panasonic Semiconductor 功能描述:10 A MINIATURE POWER RELAY
DKNIL24VF 制造商:PANASONIC 制造商全称:Panasonic Semiconductor 功能描述:10 A MINIATURE POWER RELAY
DKNIL24VNIL 制造商:PANASONIC 制造商全称:Panasonic Semiconductor 功能描述:10 A MINIATURE POWER RELAY