FlexRay Communication Controller (FlexRAY)
PXN20 Microcontroller Reference Manual, Rev. 1
26-6 Freescale Semiconductor
26.1.6.2.1 Enter Normal Mode
This mode is entered when the application requests the controller to leave the Disabled Mode. If the
Normal Mode was entered by leaving the Disabled Mode, the application has to perform the protocol
initialization described in Section 26.7.1.2, Protocol Initialization, to achieve full FlexRay functionality.
Depending on the values of the SCM, CHA, and CHB bits in the Module Configuration Register (MCR),
the corresponding FlexRay bus driver ports are enabled and driven.
26.2 External Signal Description
This section lists and describes the controller signals, connected to external pins. These signals are
summarized in Table 26-2 and described in detail in Section 26.2.1, Detailed Signal Descriptions.
NOTE
The off chip signals FR_A_RX, FR_A_TX, and FR_A_TX_EN are
available on each package option. The availability of the other off chip
signals depends on the package option.
26.2.1 Detailed Signal Descriptions
This section provides a detailed description of the controller signals, connected to external pins.
26.2.1.1 FR_A_RX — Receive Data Channel A
The FR_A_RX signal carries the receive data for channel A from the corresponding FlexRay bus driver.
26.2.1.2 FR_A_TX — Transmit Data Channel A
The FR_A_TX signal carries the transmit data for channel A to the corresponding FlexRay bus driver.
Table 26-2. External Signal Properties
Name Direction Active Reset Function
FR_A_RX Input — — Receive Data Channel A
FR_A_TX Output — 1 Transmit Data Channel A
FR_A_TX_EN
Output Low 1 Transmit Enable Channel A
FR_B_RX Input — — Receive Data Channel B
FR_B_TX Output — 1 Transmit Data Channel B
FR_B_TX_EN
Output Low 1 Transmit Enable Channel B
FR_DBG[0] Output — 0 Debug Strobe Signal 0
FR_DBG[1] Output — 0 Debug Strobe Signal 1
FR_DBG[2] Output — 0 Debug Strobe Signal 2
FR_DBG[3] Output — 0 Debug Strobe Signal 3
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