R&S RTO6 - Page 637

Protocol analysis
R&S
®
RTO6
637User 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 R
T
O6-K520)