Tektronix MDO4054-3, User Manual, Page: 84 / 222

Acquire the Signal
9. Push B1 , B2 , B3 , or B4 and turn multipurpose
knob a to move the bus display up or down
on the screen.
I
2
C Bus
To acquire data from an I
2
C bus, you need to also set up these items:
1. If you select I2C , push De fi ne Inputs and
the appropriate side-bezel menu choices.
Bus B1
I2C
De fi ne
Inputs
Thresholds Include
R/W in
Address
No
B1 Label
I2C
Bus
Display
Event
Table
You can assign the prede fi ned SCLK Input
or SDA Input to the channel connected to
the signal.
2. Push Include R/W in Address and then
push the desired side-bezel button.
This control determines how the oscilloscope
shows the I
2
C addresses in bus decode
traces, cursor readouts, Event Table listings,
and trigger settings.
If you select Yes , the oscilloscope displays 7-bit addresses as eight bits, where the eighth bit (LSB) is the R/W bit. It
displays 10-bit addresses as 11 bits where the third bit is the R/W bit.
If you select No , the oscilloscope displays 7-bit addresses as seven bits, and 10-bit addresses as ten bits.
In the physical layer of the I
2
C protocol, 10 bit I
2
C addresses are preceded by the fi ve bit code, 11110. The oscilloscope
does not include these fi ve bits in address readouts.
SPI Bus
To acquire data from an SPI bus, you need to also set up these items:
1. If you selected SPI , push De fi ne Inputs and
the appropriate side-bezel menu choices.
Bus B1
SPI
De fi ne
Inputs
Thresholds Con fi gure B1 Label
SPI
Bus
Display
Event
Table
You can set the Framing to SS (Slave
Select) or to Idle Time.
You can assign the prede
fi ned SCLK , SS ,
MOSI , or MISO signals to any channel.
2. Push Con fi gure and the desired side-bezel
menu choices.
MDO4000 Series Oscilloscopes User Manual 65