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Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs 4
4000 X-Series Oscilloscopes Advanced Training Guide 113
Your scope should now be triggering on LIN frame = 21
HEX
as shown in
Figure 75. With this scope’s very fast hardware- based decoding, you
should also see that the frame ID field (left- most decoded byte) is
sometimes displayed in red. This is an indication that the scope is
capturing and quickly decoding infrequent parity bit errors. If the scope
detects a checksum error, the last byte in the serial string (checksum byte)
will be displayed in red. Note that Frame ID = 12
HEX
contains an
occasional checksum error. If you change to the trigger condition to trigger
on ID = 0x12, you can observe this particular type of error. Let’s now
capture a very long stream of LIN traffic (2 seconds of acquisition time)
and then manually search through the captured and decoded record.
16 Press the [Serial] front panel key.
17 Tap the Lister softkey; then select Half-Screen from the Window menu.
18 Set the scope’s timebase to 200.00 ms/div.
19 Press [Run/Stop] to stop repetitive acquisitions.
20 Tap the Scroll Lister softkey; then turn the Entry knob to manually scroll
through the lister table.
Figure 75 While triggering on LIN frame = 21
HEX
, the scope’s hardware-based decoding
reveals parity bit errors in the frame ID field.
- Agilent 4000 X-Series 1
- Oscilloscopes 1
- Contents 3
- Getting Started 5
- Front Panel Overview 6
- Run Control 7
- Waveform Controls 7
- Horizontal Controls 8
- Vertical Controls 9
- Trigger Controls 9
- Tools Controls 10
- Advanced Training Guide 11
- Lab #3: Using Waveform Math 23
- Lab #6: Using Mask Test 37
- Trigger Point 45
- Next Valid Trigger Event 45
- , which is coincident with 77
- Acquisition Labs 79
- C Serial Bus Signals 80
- 13 Tap the Mode I 88
- 14 Tap the Signals softkey 88
- 10 Tap the Mode I 111
- S Serial Bus Signals 118
- (USB) Signals 132
- USB traffic 138
- Theory of Operation 151
- DSO Block Diagram 152
- ADC Block 152
- Attenuator Block 153
- DC Offset Block 153
- Amplifier Block 153
- Display DSP Block 155
- Rule of Thumb 159
- Step 2: Calculate f 160
- Related Agilent Literature 165
- C Related Agilent Literature 166
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