NXP Semiconductors MPC5644A, Reference Manual, Page: 1617 / 1735

FlexRay Communication Controller (FlexRay)
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 1617
33.7.1.1.1 System bus wait state constraints
The SYMATOR[TIMEOUT] value corresponds directly to a certain acceptable number of wait states on
the system bus.
For single channel configurations and if the sync frame table generation functionality is not used
(FR_SFTCCSR[SDVEN,SIDEN] = 0) no timeout will be detected if less than
2*SYMATOR[TIMEOUT] + 1 wait states will be seen on the system bus for each system bus access.
For dual channel configurations, or if the sync frame table generation functionality is used, no timeout will
be detected if less than SYMATOR[TIMEOUT] - 1 wait states will be seen on the system bus for each
system bus access.
33.7.2 Initialization Sequence
This section describes the required steps to initialize the CC. The first subsection describes the steps
required after a system reset, the second section describes the steps required after preceding shutdown of
the CC.
33.7.2.1 Module Initialization
This section describes the module related initialization steps after a system reset.
1. Configure CC.
a) configure the control bits in the Module Configuration Register (FR_MCR)
b) configure the system memory base address in System Memory Base Address Register
(FR_SYMBADR)
2. Enable the CC.
a) write 1 to the module enable bit MEN in the Module Configuration Register (FR_MCR)
The CC now enters the Normal Mode. The application can commence with the protocol initialization
described in
Section 33.7.2.2, Protocol Initialization ”.
33.7.2.2 Protocol Initialization
This section describes the protocol related initialization steps.
1. Configure the Protocol Engine.
a) issue CONFIG command via Protocol Operation Control Register (FR_POCR)
b) wait for POC:config in Protocol Status Register 0 (FR_PSR0)
c) configure the FR_PCR0,..., FR_PCR30 registers to set all protocol parameters
2. Configure the Message Buffers and FIFOs.
a) set the number of message buffers used and the message buffer segmentation in the Message
Buffer Segment Size and Utilization Register (FR_MBSSUTR)
b) define the message buffer data size in the Message Buffer Data Size Register (FR_MBDSR)
c) configure each message buffer by setting the configuration values in the Message Buffer
Configuration, Control, Status Registers (FR_MBCCSRn) , Message Buffer Cycle Counter