Owon XDS3204E User Manual page 66

3. SPI Decoding
To decode SPI signal:
(1) Connect the clock line (SCLK) and the data line (SDA) of the SPI signal to the
Signal Input Channels of the oscilloscope.
(2) Adjust to the proper time base and voltage division.
(3) In trigger menu, select Bus trigger, and select bus type as SPI, set parameters
based on the characteristics of the signal, trigger the signal correctly and obtain
stable display. Refer to "SPI Trigger" on page 54.
(4) Push the Decode button on the front panel. Select bus type as SPI. set parameters
based on the characteristics of the signal. When the parameters are set correctly,
the information carried by the signal will be displayed.
Tip: If there are repetitive menu items in both trigger menu and decoding menu, you
can set anyone of them, the other will be changed synchronously.
Note:
 Use the Trigger Level knob to adjust the thresholds of bus trigger and bus
decoding.
 LS First in Bit Order menu item (Least Significant Bit First) means that the least
significant bit will arrive first: hence e.g. the hexadecimal number 0x12, will
arrive as the sequence 01001000 in binary representation, will be decoded as the
reversed sequence 00010010.
SPI Decoding menu list:
MENU SETTING
Bus Type SPI
SCLK
Time Out
Configure
Data Bits
Bit Order
Format
Display
EventTable
4.Advanced User Guidebook
INSTRUCTION
Set bus type of decoding as SPI.
Select the clock edge to match the signal, sample the
SDA data on the rising or falling edge of the clock.
Set the minimum time that the clock (SCL) signal must
be idle before the oscilloscope starts to search for the data
(SDA) on which to trigger. The range is 30 ns to 10 s.
Set the data width of each frame to match the signal. It
can be set to any integer between 4 and 32.
Select LS First or MS First to match the signal.
Binary
Decimal
Set the display format of the bus.
Hex
ASCII
ON
Select "ON" to display the event table.
OFF
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