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DK-MAXII-1270N

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P38
Altera Corporation Development Kit Version 1.1.0 2–11
July 2005 MAX II Development Kit Getting Started User Guide
Getting Started
V_INT shows the Core V
CC
rise time, and the rise time variation caused
by POT1. ACTIVE_IO is driven by a MAX II user I/O pin that helps
demonstrate the instant MAX II becomes functional (powered-up and
configured).
Figure 2–4 shows a typical digital oscilloscope output. For this test the
V
CCINT
rise time is 10 ms. The device is functional at 2.18 V, well below the
minimum V
CC
level of 3.0 V. The I/O Pin starts out low, and at about a
core V
CC
of 1.25 V the I/O pull-up becomes active and the I/O goes to the
V
CCIO
level.
1 In the development board setup, the V
CCIO
ring is on a different
supply than V
CCINT
. The V
CCIO
ring is a constant 3.3 V and does
not power cycle when S5 is pressed.
In Figure 2–4, the MAX II representative I/O (labeled Active I/O on the
test point on the board), switches to 0 V when V
CCINT
is at 2.18 V. It
switches after configuration is complete and the core registers are reset,
and released and the I/O are released. Once working, this I/O pin will
begin to oscillate with a high and low period equal to T
CONFIG
, the time
needed to move the configuration data from the Configuration Flash
Memory (CFM) to the configuration SRAM. The first falling edge on this
I/O (shown in the lighter color in Figure 2–4) is when configuration is
complete. Measuring back the T
CONFIG
of the first low pulse width of this
Active I/O will show at approximately what core voltage configuration
started.
2–12 Development Kit Version 1.1.0 Altera Corporation
MAX II Development Kit Getting Started User Guide July 2005
Demo Designs
Figure 2–4. Digital Oscilloscope Image of V
CCINT
and MAX I/O During Power-Up
Low Power Demonstration
MAX II devices consume very little power, making them ideal for use in
systems where power is at a premium. The MAX II development board is
equipped with two current sense circuits that allow users to measure the
power consumed by the MAX II device at different design densities and
toggle rates.
This demonstration provides an easy way to increase the number of
registers in the design and the rate at which they are toggling. This gives
you some understanding of the power that a MAX II device requires. The
demonstration measures the current drawn by V
CCINT
as the number of
toggling registers (and the rate at which they toggle) is increased or
decreased.
To calculate the power drawn, multiply the number of toggling registers
by the voltage supply of V
CCINT
(if the shunt on J9 is in place,
V
CCINT
= 2.5 V; if the shunt is off, V
CCINT
= 3.3 V). Note that the power can
always be calculated by measuring the voltage across the current sense
resistors and then using Ohm’s Law to calculate the current. The V
CCINT
current is measured across two parallel 0.33 ohm resistors (R109 and
R113). You can measure the voltage across either one of these resistors and
then divide that by 0.165 ohms (the two 0.33 ohm resistors are in parallel
for a total resistance of 0.165). Use Ohm’s Law to calculate the current and
Altera Corporation Development Kit Version 1.1.0 2–13
July 2005 MAX II Development Kit Getting Started User Guide
Getting Started
then the power. Similarly, the current drawn by V
CCIO
is measured across
R95 and R99. Using the same technique as described for V
CCINT
allows
you to calculate the total power being consumed by the MAX II device.
1 This circuit uses resistors with a specified variance of 5%, which
means that the power measurement is not precise. This circuit is
provided to give users a general understanding of the MAX II
device power consumption. Users who need a precise power
measurement should remove the resistors and measure the
current with a multimeter across one of the pads where R109
and R113 reside. Users concerned with power consumption
should also consult the Understanding & Evaluating Power in
MAX II Devices chapter of the MAX II Device Handbook.
On-Board Circuit
The MAX II device current draw is measured across two 0.33 ohm
resistors via a current sense device. The output of this device is fed to an
A/D converter that generates a digital (serial) output to the MAX II
device. The value of this number provides an indication of the current
that is consumed by the MAX II device, allowing you to determine how
much power the MAX II device is consuming.
f Refer to the MAX II Development Board Data Sheet and the MAX II
development board schematics for more information about the on-board
circuitry.
Using the Demo
To use this demo, first program the MAX II device with the
LowPowerDemo.pof file in the <install directory>/Examples/
HW/Demos directory. (Refer to “Programming the MAX II Device” on
page 2–4 for details on how to load POF files into the MAX II device.)
After programming finishes, the LCD will read:
Current Is 24 mA
000 FF’s
The switches control the operation of this demo:
■ Switch 1 = reset
■ Switch 2 = increase the number of flip-flops that are toggling by 150
■ Switch 3 = decrease the number of flip-flops that are toggling by 150
■ Switch 4 = double the rate at which the flip-flops are toggling
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P38

DK-MAXII-1270N

Mfr. #:
Buy DK-MAXII-1270N
Manufacturer:
Intel / Altera
Description:
Programmable Logic IC Development Tools CPLD Development Kit For EPM1270F256
Lifecycle:
New from this manufacturer.
Delivery:
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