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15
Protocol Decoding
You can use the protocol analysis to discover errors, debug hardware, and accelerate
development easily, ensuring you to accomplish the projects with high speed and
good quality. Protocol decoding is the basis of protocol analysis. Only protocol
analyses with correct protocol decoding are acceptable, and only correct protocol
decoding can identify more error information. This series oscilloscope provides four
bus decoding modules (Decode 1, Decode 2, Decode 3, and Decode 4) to make
common protocol decoding (including Parallel (standard), RS232 (option), I2C
(option), SPI (option), LIN (option), CAN (option), FlexRay (option), I2S (option), and
1553B (option)) for the input signals of the analog channels (CH1-CH4) and the digital
channels (D0-D15). As the decoding functions and setting methods of Decode1,
Decode2, Decode3, and Decode4 are the same, this chapter takes Decode1 as an
example for illustration.
Press on the front panel to open the decode setting menu, or enable the touch
screen to tap the function navigation icon at the lower-left corner of the screen to
open the function navigation. Then, tap the "Decode" icon to open the decode
setting menu.
To get the decoding option information, refer to descriptions in "
Appendix A: Options
and Accessories
".
If you have purchased the decoding option, activate it according the descriptions in
"
To View the Option Information and the Option Installation
".
15.1 Parallel Decoding
Parallel bus consists of clock line and data line. As shown in the figure below, CLK is
the clock line, whereas Bit0 and Bit1 are the 0 bit and 1st bit on the data line
respectively. The oscilloscope will sample the channel data on the rising edge, falling
edge, or the rising/falling edge of the clock and judge each data point (logic "1" or
logic "0") according to the preset threshold level.
Protocol Decoding
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