FlexRay Electrical Physical Layer Specification Table of contents
Version 3.0.1 October 2010 Page 5 of 134
8.2.4 BD_ReceiveOnly mode (optional) .................................................................................................47
8.2.5 BD_Off ...........................................................................................................................................47
8.3 Operation mode transitions .................................................................................................................48
8.3.1 Overview ........................................................................................................................................48
8.3.2 Mode transitions due to detection of undervoltage conditions ......................................................49
8.3.3 Mode transitions in case of undervoltage recovery .......................................................................49
8.3.4 Mode transitions due to detected wakeup events .........................................................................50
8.3.5 Power on event ..............................................................................................................................50
8.3.6 Power off event ..............................................................................................................................50
8.4 Bus driver – communication controller interface .................................................................................51
8.4.1 Overview ........................................................................................................................................51
8.4.2 RxD - behavior ...............................................................................................................................51
8.4.3 TxD/TxEN behavior in case a bus driver - bus guardian interface is implemented ......................52
8.4.4 TxD/TxEN - behavior in case a bus driver - bus guardian interface is not implemented ..............52
8.4.5 TxEN – RxD loopback ...................................................................................................................52
8.4.6 Electrical characteristics ................................................................................................................53
8.5 Bus driver – bus guardian interface (optional) ....................................................................................54
8.6 Bus driver – host interface ..................................................................................................................55
8.6.1 Overview ........................................................................................................................................55
8.6.2 Hard wired signals (Option A) .......................................................................................................55
8.6.3 Serial peripheral interface (SPI) (Option B) ...................................................................................58
8.7 Bus driver – power supply interface ....................................................................................................59
8.7.1 V
CC
supply voltage monitoring .......................................................................................................59
8.7.2 V
BAT
supply voltage monitoring ......................................................................................................59
8.7.3 Inhibit output (optional) ..................................................................................................................60
8.8 Bus driver - level shift interface (optional) ...........................................................................................60
8.8.1 V
IO
voltage monitoring ...................................................................................................................60
8.9 Bus driver - bus interface ....................................................................................................................61
8.9.1 Overview ........................................................................................................................................61
8.9.2 Transmitter characteristics ............................................................................................................61
8.9.3 Transmitter behavior at transition from idle to active and vice versa ............................................63
8.9.4 Receiver behavior (in non-low power mode) .................................................................................64
8.9.5 Receiver characteristics ................................................................................................................65
8.9.6 Receiver timing characteristics ......................................................................................................67
8.9.7 Receiver behavior at transition from idle to active and vice versa ................................................69
8.9.8 Receiver behavior (in low power mode) ........................................................................................70
8.9.9 Bus driver - bus interface behavior, when in BD_Off mode ..........................................................71
8.9.10 Bus driver - bus interface behavior under short-circuit conditions ..............................................71
8.9.11 Bus driver - bus interface simulation model parameters .............................................................71
8.10 Bus driver – wakeup interface (optional)...........................................................................................72
8.10.1 Wakeup via dedicated WAKE pin ................................................................................................72
8.10.2 Local wakeup operating requirements ........................................................................................72
8.11 Remote wakeup event detector (optional) ........................................................................................72
8.11.1 Wakeup with wakeup patterns independent of data rate ............................................................72
8.11.2 Wakeup with frames in 10Mbit/s systems ...................................................................................73
8.11.3 Wakeup state machine ................................................................................................................73
8.11.4 Remote wakeup operating requirements ....................................................................................74
8.12 Bus driver behavior under fault conditions ........................................................................................75
8.12.1 Environmental errors ...................................................................................................................75
8.12.2 Behavior of unconnected digital input signals .............................................................................76
8.12.3 Behavior with dynamic low battery voltage .................................................................................77
8.12.4 Behavior with dynamic low supply voltage ..................................................................................77
8.12.5 Bus failure detection ....................................................................................................................78
8.12.6 Over-temperature protection .......................................................................................................78
