YOKOGAWA DLM3024 User Manual

4-30
IM DLM3054-01EN
Digitalization in the Trigger Circuit
After the input signal from the FlexRay bus is digitized by the trigger comparator, the trigger circuit samples it
using the internal clock. Then noise is removed by the majority filter in the Voting Window.
11111
11111 11110 11100
11001 1001100111 01111
11110
11100 11000
0000000000 000000000000000 00001 0001100111
01111
Trigger comparator
output
Voting Window
Voted data
Internal sampling
clock
Glitch
noise
1 bit is equal to 8 sampling clock periods. The sampling counter is reset at the BSS falling edge of the voted
data. The voted data value when the value of this sampling counter reaches 5 is used as the bit value for
detecting the trigger conditions.
00 00
00 00
0
1
1
1
1
1 11 1
1
1
1
1
1 11 1
0
0
0
0
0 00 0
X
0
1
1
1
1
1 11 1
0
0
0
0
0 00 0
X
1 1
21 43 52 3
32 54
7
6
1
8
2 43 5
7
6
1
8
2 43 5
2
1
4
3
5 76 8
1
1
3
2
5
4
6 87 1
1
3
2
5
4
6 87 1
TSS FSS BSSn byte BSSn+1
Bit slope
Bit value
0 0 1 1 0
1
0
Voted data
Sampling
counter
CAN Bus Trigger [ENHANCED, option]
The instrument triggers based on the trigger conditions of a particular frame or type of data in a CAN bus signal.
1 11 1 1 1 4 158N (0≤N≤8) 1 1 1
ID 10 -0
Arbitration Field
Control Field Data Field CRC Field
ACK
CAN Data Frame (Standard)
DLC
3 -0
CRC
Sequence
Data
7
EOF
Recessive
Dominant
SOF
RTR
IDE
r0
ACK Delimiter
ACK slot
CRC Delimiter
Trigger Mode (Mode)
Select the CAN bus trigger mode from one of the settings below.
SOF: Triggers on the start of a frame
Error: Triggers on errors
ID/Data: Triggers on the AND of the ID bit pattern and Data pattern
ID OR: Triggers on the OR of multiple ID bit patterns
SOF(Start of Frame)
The instrument triggers on the start of CAN bus signal frames.
Error
The instrument triggers on error frames (when the error flag is active) or when it detects various errors.
• Error Type (Error Type Or)
Select the types of errors to detect from the following. The instrument triggers if any of the selected errors is
detected.
Error Frame When an active error flag (indicated by six consecutive dominant bits) is
detected
Stuff When stuff bits are not inserted properly
CRC When a CRC error is detected
4 Triggering

YOKOGAWA DLM3024 Specifications

General

Brand	YOKOGAWA
Model	DLM3024
Category	Test Equipment
Language	English