NXP Semiconductors MPC5644A, Reference Manual, Page: 1621 / 1735

FlexRay Communication Controller (FlexRay)
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 1621
33.7.8 Message buffer search on simple message buffer configuration
This sections describes the message buffer search behavior for a simplified message buffer configuration.
The FIFO behavior is not considered in this section.
33.7.8.1 Simple message buffer configuration
A simple message buffer configuration is a configuration that has at most one transmit message buffer and
at most one receive message buffer assigned to a slot
S . The simple configuration used in this section
utilizes two message buffers, one single buffered transmit message buffer and one receive message buffer.
The transmit message buffer has the message buffer number t and is configured as shown in Table 33-138 .
ALL_SLOTS 4 FREEZE, READY,
CONFIG_COMPLETE,
fatal protocol error
FREEZE, READY, CONFIG_COMPLETE,
fatal protocol error
ALLOW_COLDSTART 5
RUN 6 FREEZE,
fatal protocol error
WAKEUP 7 FREEZE,
fatal protocol error
DEFAULT_CONFIG 8 FREEZE,
fatal protocol error
CONFIG 9
HALT (lowest) 10 FREEZE, READY, CONFIG_COMPLETE,
fatal protocol error
Table 33-138. Transmit buffer configuration
Register Field Value Description
FR_MBCCSR t MCM — used only for double buffers
MBT 0 single transmit buffer
MTD 1 transmit buffer
FR_MBCCFR t MTM 0 event transition mode
CHA 1 assigned to channel A
CHB 0 not assigned to channel B
CCFE 1 cycle counter filter enabled
CCFMSK 000011 cycle set = {4n} = {0,4,8,12,...}
CCFVAL 000000
FR_MBFIDR t FID S assigned to slot S
Table 33-137. Protocol control command priorities (continued)
Protocol command Priority Interrupted by Cleared and terminated by