Chapter 8 Protocol Decoding RIGOL
MSO4000/DS4000 User’s Guide 8-3
2) Specify the edge type of sampling
Press Slope and turn the multi-function knob to set the oscilloscope to
sample the channel data on the rising edge (
), falling edge ( ) or
rising&falling edges ( ) of the clock signal. You can also press Slope
continuously to switch the current edge type.
3. Set the data line
1) Set the bus bits
Press Bus Bits and turn the multi-function knob to set the data width
of the parallel bus (namely the number of bits of each frame of data). The
range is from 1 to 20 and the default is 8 (Bit0, Bit1, Bit2…).
2) Specify data channel for each bit
First, press CurrentBit and turn the multi-function knob to select the
bit that needs to specify a channel. The range available is from 0 to (the
current bus bits – 1). By default, bit 0 is selected. For example, when the
bus bits is 20, the range available is from 0 to 19.
Then, press Channel, turn the multi-function knob to select the
desired channel and press the knob. You can also press Channel
continuously to switch the channel currently selected. The channels
available include D0 to D15 and CH1 to CH4.
4. Adjust the analog channel threshold level
When the clock channel or data channel selected include analog channels (CH1
to CH4), you can set the threshold level of the specified analog channels
according to your need. When the channel signal amplitude is greater than the
preset threshold, it is judged as logic “1”; otherwise logic “0”.
Channel Signal Amplitude
Channel Logic Level
Threshold Level
1
0
0
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