PXR40RM Datasheet, PDF (736/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

FlexRay Communication Controller (FLEXRAY)
If the command execution block of the PE is idle, it selects the next accepted protocol command with the
highest priority from the current protocol command vector according to the protocol control command
priorities given in Table 22-119. If the current protocol state does not allow the execution of this protocol
command (see POC state changes in FlexRay Communications System Protocol Specification, Version 2.1
Rev A) the controller asserts the illegal protocol command interrupt flag IPC_IF in the Protocol Interrupt
Flag Register 1 (PIFR1). The protocol command is not executed in this case.
Some protocol commands may be interrupted by other commands or the detection of a fatal protocol error
as indicated by Table 22-119. If the application issues the FREEZE or READY command, or if the PE
detects a fatal protocol error, some commands already stored in the command vector will be removed from
this vector.
Table 22-119. Protocol Control Command Priorities
Protocol Command Priority
Interrupted By
Cleared and Terminated By
FREEZE
READY
CONFIG_COMPLETE
ALL_SLOTS
ALLOW_COLDSTART
RUN
WAKEUP
DEFAULT_CONFIG
CONFIG
HALT
(highest) 1
2
none
3
4
FREEZE, READY, CONFIG_COMPLETE,
fatal protocol error
5
6
FREEZE,
FREEZE,
READY,
fatal protocol error
CONFIG_COMPLET,
7 _{fatal protocol error} FREEZE,
fatal protocol error
8
FREEZE,
fatal protocol error
9
(lowest) 10
FREEZE, READY, CONFIG_COMPLETE,
fatal protocol error
22.7.5 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.
22.7.5.1 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 has following configuration
22-152
PXR40 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor