2.8.2 RXMode(transparent)

In the RXMode(transparent), the transceiver provides the received data stream on pin 17 (TMDO) after a wake check OK (WCO) and a corresponding data clock on pin 19 (TMDO_CLK) after a valid start of telegram (SOT).

The following figure shows a timing diagram of TMDO and TMDO_CLK in NRZ mode. TMDO_CLK has a 50% duty cycle, therefore, the data can be sampled either at the rising or the falling edge. Before a WCO, the TMDO line is LOW.

Figure 2-18. Timing Diagram for TMDO and TMDO_CLK in NRZ Mode

The following figure shows a timing diagram for TMDO and TMDO_CLK in Manchester mode. TMDO_CLK has a 50% duty cycle, therefore, the data can be sampled either at the rising or the falling edge.

If default polarity is selected (see Data Polarity), inverted data are received at the rising edge and correct data are received on the falling edge of TMDO_CLK. If inverted polarity is selected, correct data are received at the rising edge and inverted data are received on the falling edge of TMDO_CLK. Before WCO, the TMDO line is LOW.

Figure 2-19. Timing Diagram for TMDO and TMDO_CLK in Manchester Mode

If both demodulator receive paths are activated, the signals generated on pins TMDO and TMDO_CLK come from the path that recognized the first WCO.

Exception:

If the eepServices.rxSysSet.PathValidAfterSOT_ENA EEPROM variable is set to ‘1’, TMDO and TMDO_CLK are provided simultaneously for the path that recognized the first SOT. A WCO detection does not provoke a TMDO output in this case.

On the detection of valid data on path A and path B at the same time, path A is used for data reception.

RXMode(transparent) provides internal status information using the event flags of the event.system (R15) and event.events (R14), as shown in the general part of RXMode.