PXS20RM Datasheet, PDF (861/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

FLEXRAY
CHI
reg(A)
cfg(A)
reg(B)
cfg(B)
FlexRay Communication Controller
PE
channel 0
cCrcInit[A]
channel 1
cCrcInit[B]
CA_RX
CA_TX
CA_TR_EN
FlexRay Channel A
FlexRay Bus Driver
Channel A
CB_RX
CB_TX
CB_TR_EN
FlexRay Channel B
FlexRay Bus Driver
Channel B
Figure 26-149. Dual Channel Device Mode
26.6.10.2 Single Channel Device Mode
The single channel device mode supports devices that have only one FlexRay port available. This FlexRay
port consists of the signals CA_RX, CA_TX, and CA_TR_EN and can be connected to either the physical
bus channel A (shown in Figure 26-150) or the physical bus channel B (shown in Figure 26-151).
If the device is configured as a single channel device by setting FR_MCR.SCD to 1, only the internal
channel A and the FlexRay Port A is used. Depending on the setting of FR_MCR.CHA and
FR_MCR.CHB, the internal channel A behaves either as a FlexRay Channel A or FlexRay Channel B. The
bit FR_MCR.CHA must be set, if the FlexRay Port A is connected to a FlexRay Channel A. The bit
FR_MCR.CHB must be set if the FlexRay Port A is connected to a FlexRay Channel B. The two FlexRay
channels differ only in the initial value for the frame CRC cCrcInit. For a single channel device, the
application can access and configure only the registers related to internal channel A.
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
26-149