Arbitration - Infineon S6BT112A Getting Started

Getting Started with CXPI Transceiver S6BT112A
Software configuration
Figure 10 Transition timing from Sleep mode to Normal mode (Slave node trigger)
4.2

Arbitration

The arbitration function of the CXPI protocol is implemented by using the MCU and transceiver.
Bitwise arbitration within the UART frame is performed on the transceiver side, and bytewise arbitration
between UART frames is performed on the MCU side.
Figure 11 shows the timing chart of S6BT112A bitwise arbitration.
When PID transmission is in Normal mode, S6BT112A compares the transmitted bit with the bit received from
the CXPI BUS. If they match, the BUS output continues. If they do not match, it means that the node lost the
arbitration; the BUS output of S6BT112A becomes High-Z to cancel the transmission of the remaining PID bits.
Even if the node lost the arbitration, it continues data reception from the BUS.
Figure 11 S6BT112A arbitration function timing
Application Note 13 of 19 002-27376 Rev. *A
2021-06-15