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4.Advanced User Guidebook
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
INSTRUCTION
Bus Type SPI Set bus type of decoding as SPI.
Configure
SCLK
Select the clock edge to match the signal,
sample the
SDA data on the rising or falling edge of the clock.
Time Out
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.
Data Bits
Set the data width of each frame to match the signal. It
can be set to any integer between 4 and 32.
Bit Order
Select LS First or MS First to match the signal.
Display
Format
Binary
Decimal
Hex
ASCII
Set the display format of the bus.
EventTable
ON
OFF
Select "ON" to display the event table.
59
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