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Tektronix DPO
ZZZ
Demo 1 Board
Instruction Manual
www.tektronix.com
071253900*
*P
071-2539-00
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P.O . Bo x 50 0
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R 97077
DPO Demo 1 Board
The Tektronix DPO Demo 1 board provides signals you can use to demonstrate
features of Tektronix oscilloscopes.
Signals
Connections
Plug a USB cable between your computer and the Demo 1 board. When you apply
power to the demo board, a green LED on the board turns on.
Figure 1: USB Power connector and LED, connection points, and signal names
I2CBus
Demo 1 Board Instruction Manual 1
Board label. I2C SDA, SCLK
Description. This is the I
and a serial EEPROM.
There are several different types of data packets.
2
C (Inter-IC Communication) bus signal between the uC
DPO Demo 1 Board
SPI Bus
The clock signa
YouneedtoselecttheI
(See page 5, Sel
Board label. SCLK, SPI SS, SPI MOSI
Description. These are SPI (Serial Peripheral Interface) serial bus signals.
The SPI bus works as follows:
SCLK rising edge latch
Active Low SS
Active High MOSI
Packets occur intermittently, as close together as about 400 μsec.
The clock signal is 625 kHz, and 0 to 5 volts.
You need to select the SPI bus standard on the demo board to activate the bus.
(See page 5, Select a Serial Standard and Interpret the LED.)
lis100kHz,and0to5volts.
2
C bus standard on the demo board to activate the bus.
ect a Serial Standard and Interpret the LED.)
CAN Bus
RS-232 Bu
Board label. CAN_H, CAN_L
Descripti
The bit rate of the data packet is about 20 kbps.
You need to select the CAN bus standard on the demo board to activate the bus.
(See page 5, Select a Serial Standard and Interpret the LED.)
Board lab
s
Description. This is the RS-232 bus transmit signal (TX).
The decoded data packets display an ASCII string. Set the instrument to trigger
on the letter Q (hex value 51) and the instrument displays the w ord Quickstart.
There are no matching receive or data flow control signals.
Thebaudrateis9600. Thedataformatis1start bit, and 8 data bits with no parity.
You need to select the RS232 bus standard on the demo board to activate the bus.
(See page 5, Select a Serial Standard and Interpret the LED.)
on. These are CAN (Controller Area Network) s erial bus signals.
el. RS232 TX
2 Demo 1 Board Instruction Manual
DPODemo1Board
2nsPulse
Crosstalk
Fast Edge
FF Clock
Board label. 2N
Description. This signal is a 2 ns to 3 ns, 1.5 V pulse at a 3.3 ms repetition rate.
Use this signal to demonstrate the minimum pulse width capture specification
of an instrument’s acquisition system.
Push and hold the SINGLE SHOT TRIGGER button to activate the 2NS
PULSE signal and the 512 MHz oscillator.
Board label. XTALK1, XTALK2
Description. These are two signals with significant crosstalk between them.
Board label. FAST EDG E
Description. This is a 78 kHz capacitively coupled square wave signal with a
3 ns rise and fall time.
Board label. FF CLK
S PULSE
FF Data Input
FF Q Output
Counter Clock
Counter Output Bits
Description. This is the 20 MHz clock input signal to a fairly fast flip-flop.
Board label. D INPUT
Description. This is an approximate 1.1 MHz data input signal to a fairly fast
flip-flop that is asynchronous to the clock input.
Board label. Q OUTPUT
Description. This is the Q output signal of the fairly fast flip-flop. This signal
shows metastable behavior infrequently.
Board label. CNT CLK
Description. This is the 10 MHz clock s ignal for the 7-bit Counter Output signals.
Board label. CNTOUT0: CNTOUT6
Description. These are the 7-bits of the binary counter. The LSB is CNT OUT0 at
5 MHz, that is, half of the counter input clock.
Demo 1 Board Instruction Manual 3
DPO Demo 1 Board
Random Burst
Random Anomaly
1k Resistance in Series
With the Random Anomaly
Board label. R.
Description. This signal produces a burst of logic pulses every 1.1 ms. The burst
pulses vary in width from 100 ns to 500 ns.
Board label. R. ANOM
Description. There are two frequently occurring anomalies in this pulse train.
There is a half-height runt pulse that occurs infrequently within a burst. Use a
Runt trigger to isolate the signal.
There is an approximately 25 ns (narrow) pulse that occurs infrequently within a
burst. Use a Pulse Width trigger to isolate the signal.
pulse train is a repeating group of four pulses: 100 ns, 200 ns, 100 ns, and
The
100 ns wide. The group repeats at a 1.6 μsrate.
Board label. R.A. 1K
Description. This is the same Random Anomaly signal with a 1k resistor between
the driver and the pin. Use to demonstrate probe loading effects on the ability to
find runts and narrow pulses.
BURST
Single Shot Trigger
250 Hz
40 MHz
Amplitude Modulation
Board label. SS TRIG
Description. PushandholdtheSINGLE SHOT TRIGGER button to initiate
the 2NS PULSE signal and the 512 MHz oscillator.
Board label. 250 HZ
Description. This is a 250 Hz to 300 Hz, 5 volt, square wave signal.
Board label. 40 MHZ
Description. This is a 40 MHz, 5 volt, square wave signal.
Board label. AM MOD
Description. This is an 11.5 kHz carrier amplitude signal modulated by a 500 H z
sine wave signal.
The AM MOD signal is centered around ground. Set the oscilloscope trigger level
to the top or bottom of the waveform to stabilize the waveform on the display.
4 Demo 1 Board Instruction Manual
DPODemo1Board
Operating the
DPO Demo 1 Board
Figure 2
Select a Serial Standard and Interpret the LED. Push the SERIAL SELECT
button at the bottom of the DPO Demo 1 board. Each time you push the button,
the demo board activates a different serial standard: RS-232, I
Notice
right side of the board for their clock signals.
Create Random Errors (RS-232 Only). Select the RS-232 serial standard and
push the RANDOM ERRORS button at the bottom of the demo board. This
automatically generates random error signals. The glitch frequency is random
with
around 500 ns to 50 μs.
Push
Select Between Single Shot Serial Streams and a Continuous Stream. Push the
SINGLE SHOT ON/OFF button.
Activatethe2nsPulseandthe512MHzOscillator. Push and hold the SINGLE
SHO
: DPO Demo 1 board control buttons and LEDs
2
C, SPI, and CAN.
that the I
in a 2.5 ms to 15 ms range. The glitch duration varies randomly between
the button again to stop the d emo board from generating random errors.
T TRIGGER button.
2
C and SPI signals share the same SCLK connection point on the
Demo 1 Board Instruction Manual 5
Troubleshooting the Board
Troubleshooting the Board
If your DPO Demo 1 board does not appear to work, perform the following checks:
1. Check the power.
If the demo boa
indicator will be lit. If the Power LED is not lit, try
gently pushing in the power cable on the USB
Power port.
2. Check the settings.
Look at the serial select indicator lights and
decide if they are set as you want them to be set.
rd is receiving power, the power
3. Reset the demo board. Push the RESET button
on the demo board.
If the demo board is still not acting properly, the following is a “master” reset
procedure that you can try.
1. Push and continue to hold d own the On/Off switch in the board’s Single Shot
Box.
2. Push and release the Reset switch.
3. In the Serial Select Box, all four LEDs (RS232, I2C, SPI, and CAN) should
now turn on.
4. When all four LEDs (RS232, I2C, SPI, and CAN) in the Serial Select Box go
out, release the On/Off switch.
5. A moment later, all four LEDs (RS232, I2C, SPI, and CAN) should flash
several times. Then, only the I2C LED will be lit.
6 Demo 1 Board Instruction Manual
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