Protocol analysis
R&S
®
RTO6
637
User Manual 1801.6687.02 ─ 05
Figure 13-17: Example of a SENT transmission sequence
The format of a SENT transmission sequence consists of the following pulses:
●
Synchronization/Calibration Pulse:
–
initial sequence of the receiver
–
the start condition is the falling edge of the last pulse (CRC or Pause)
–
nominal pulse period is 56 clock ticks
–
measures the actual clock variation of the transmitter and calculates the tick
timing
●
Status/Communication Pulse (Nibble)
–
one 4 bit pulse
–
communicates status and enables the sensor to include slow channel message
bits
0: (LSB) specific application
1: specific application
2: Serial Data message or specific application (e.g. Infineon TLE4998S)
3: (MSB) 1= message start; 0=Serial Data message or specific application
(e.g. Infineon TLE4998S)
–
12 to 27 clock ticks
–
not included in CRC frame calculation
●
Data Pulses (Nibbles)
–
one up to six 4 bit data nibbles
–
12 to 27 clock ticks pulse period
–
initial logic 0 time with
≥
5 ticks, subsequent logical 1 with variable duration
●
CRC/Checksum
–
one 4 bit pulse
–
used for error checking of data nibbles (status nibble not included)
–
detects single bit, odd number of nonconsecutive and single burst errors
●
Pause Pulse
–
one optional pulse
–
variable pulse length: 12 to 768 clock ticks
–
can be used to create a transmission with constant number of clock ticks
SENT (option R&S
RTO6-K520)
