RIGOL Chapter 8 Protocol Decoding
8-2 MSO4000/DS4000 User’s Guide
Parallel Decoding
The parallel bus consists of a clock line and data lines. The oscilloscope will sample
the channel data on the rising edge, falling edge or the rising&falling edges of the
clock signal; then, combine the sample data as a parallel multi-channel bus and
display the data as a single bus value. As shown in the figure below, the system
samples on the rising edge of the clock signal; wherein, CLK is the clock line, while
Bit0 and Bit1 are the 0 bit and 1st bit on the data line respectively.
Figure 8-1 Parallel Decoding Schematic Diagram
Press Decode1 Decode, turn the multi-function knob to select “Parallel” and
press the knob. You can also press Decode continuously to switch to “Parallel”.
Set the parallel decoding (take Decode1 as an example):
1. Turn on or off 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
Decode1 display is turned on, the interface is as shown in Figure 8-2.
2. Set the clock line (CLK)
1) Specify the clock channel
Press CLKChannel, turn the multi-function knob to select the desired
channel and press the knob. You can also press CLKChannel continuously
to switch the current clock channel. The channels available include CH1 to
CH4 and D0 to D15. If “None” is selected, no clock channel is set and the
oscilloscope will sample when the data of the data channel jumps in the
decoding.
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