4-48
IM DLM3054-01EN
Trigger Point
Trigger point when the trigger type is Break Synch
Break
Synch Field
Protected
Start of frame
Data 1
Data N
Checksum
Trigger point when the trigger type is
ID/Data (Don’t care)
Trigger point when the
trigger type is ID/Data
CXPI Bus Trigger [ENHANCED, option]
The trigger function uses the start of a CXPI bus signal frame or the combination of the start of a frame and the
bit pattern (PID or PTYPE field) at the start of the frame. The following figure shows the CXPI bus signal frames.
Normal Frame
IBS
Data 1 Data 2 Data NP P DLC NM CT
Frame
Type
Frame
ID
PTYPE
Field
PID
Field
Data Bytes
Field
CRC
Field
Frame
Information
………
IBS
IBS
IBS
IBS
IBS
1
byte
1 byte 4 bits 2 bits 2 bits 0
12 bytes 1 byte
IBS
Long Frame
IBS
Data 1 Data 2 Data NP P DLC NM CT
Frame
Type
Frame
ID
PTYPE
Field
PID
Field
Data Bytes
Field
CRC
Field
Frame
Information
…
IBS
IBS
IBS
IBS
IBS
Extension
DLC
1 byte
1 byte 4 bits 2 bits 2 bits 1 byte 0…255 bytes 2 bytes
IBS
IBS
PTYPE at the start of each frame is an option for the polling method.
When the option is not used, the start of the frame is a PID. Refer to this figure along with the figures in “Trigger
Point.”
Trigger Mode (Mode)
Select the CXPI bus trigger mode from one of the settings below.
SOF: Triggers on the start of a frame
Error: Triggers on errors
PTYPE: Triggers on PTYPE
ID/Data: Triggers on the position where the AND condition of the ID bit pattern, frame information, and data
pattern is met
ID OR: Triggers on the OR of multiple ID bit patterns
Wakeup/Sleep: Triggers on wakeup pulses, wakeup states, sleep frames, and sleep states
SOF(Start of Frame)
The instrument triggers on the start of CXPI bus signal frames.
Triggers can be activated on SOF alone.
* The start of a frame is found by detecting a logic 0 following 20 or more consecutive bits of logic 1’s.
4 Triggering
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