Chapter 7 Protocol Decoding RIGOL
DS4000E User’s Guide 7-17
SPI Decoding (Option)
The SPI serial bus is based on the master-slave configuration and usually consists of
the chip select line (SS), clock line (SCLK) and data lines. Wherein, the data lines
include the master input/slave output data line (MISO) and master output/slave
input (MOSI) data line. The oscilloscope samples the channel data on the rising edge
or falling edge of the clock signal and then judges each data point (logic “1” or logic
“0”) according to the preset threshold level.
Press Decode1 Decode, turn the multi-function knob to select “SPI” and
press the knob. You can also press Decode continuously to switch to “SPI”.
1. Turn on or off the Decode1
Press BusStatus to turn the Decode1 display on or off. You can also press
Decode1 to switch the current on/off status of the Decode1 display. When the
bus display is turned on, the interface is as shown in Figure 7-5.
2. Quickly apply the current SPI trigger setting to SPI decoding
If the current trigger type of the trigger system is SPI, press CopyTrig to copy
the current SPI trigger settings and apply them to the SPI decoding function (set
the corresponding SPI decoding parameters automatically). The settings that
can be copied include the CS/timeout mode, clock channel, data channel and
data bits.
For the CS mode, the CS channel (CS) and level polarity (Mode) in the
trigger setting will be copied to the CS channel (SS Channel) and
polarity (SS Polarity). The threshold level setting will also be copied.
For the timeout mode, the timeout time setting will be copied.
For the clock channel, the threshold level setting will be copied.
For the data channel, the data channel (SDA) in the trigger setting will be
copied to the MISO source channel (MISO Channel) in the decoding
setting. The threshold level will also be copied.
Note:
― After executing the copy operation, MISO Polarity in the decoding
setting will be set to
(positive polarity) automatically.
― The source channel of MOSI data line will be set to “None”
automatically.
Note: The copy function is only available when the current trigger type is “SPI”;
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