mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 178

• Manufacturer Part Number: mfr4300
• Description: Flexray Communication Controllers
• Manufacturer: Freescale Semiconductor, Inc

FlexRay Module (FLEXRAYV2)
CCFM = ‘0’ to indicate the slot assignment and to trigger the null frame transmission. In case of an receive
message buffer, this buffer is not added to the matching message buffer list.
A message buffer matches its cycle counter filter for the communication cycle with the number CCN if at
least one of the following conditions evaluates to true:
3.4.7.1.3
The message buffer channel assignment given by the CHA and CHB bits in the
Counter Filter Registers (MBCCFRn)
transmit. The message buffer with number n transmits or receives on channel A if MBCCFRn.CHA = ‘1’
and transmits or receives on channel B if MBCCFRn.CHB = ‘1’.
To ensure correct message buffer operation, all message buffers assigned to the same slot must have a
consistent channel assignment. That means that all message buffers assigned to the same slot must be
either assigned to only one channel, or assigned to both channels. The behavior of the message buffer
search is not defined, if both types of channel assignments occur for one slot. An inconsistent channel
assignment for message buffer 0 and message buffer 1 is depicted in
3.4.8
The initial configuration of each individual message buffer can be changed even when the protocol is not
in the
configuration bits and fields that can be changed are given in the section on
The common configuration data given in the section on
reconfigured when the protocol is out of the
3.4.8.1
Depending on the target and destination basic state of the message buffer that is to be reconfigured, there
are three reconfiguration schemes.
3.4.8.1.1
A reconfiguration will not change the basic type of the individual message buffer, if both the message
buffer transfer direction bit MBCCSn.MTD and the message buffer type bit MBCCSn.MBT are not
changed. This type of reconfiguration is denoted by RC1 in
178
MB0
MB1
CCN[5:0] & MBCCFRn.CCFMSK[5:0] == MBCCFRn.CCFVAL[5:0] & MBCCFRn.CCFMSK[5:0]
POC:config
Individual Message Buffer Reconfiguration
MBFIDR0.FID = 10
MBFIDR1.FID = 10
Reconfiguration Schemes
Message Buffer Channel Assignment Consistency
Basic Type Not Changed (RC1)
state. This is referred to as individual message buffer reconfiguration. The
Figure 3-127. Inconsistent Channel Assignment
MBCCFR1.CHA = 1, MBCCFR1.CHB = 1
MBCCFR0.CHA = 1, MBCCFR0.CHB = 0
MBCCFRn.CCFE == 0
defines the channels on which the message buffer will receive or
MFR4300 Data Sheet, Rev. 3
POC:config
Specific Configuration Data
state.
Figure
3-128. Single transmit and receive
Figure
single channel assignment
dual channel assignment
Specific Configuration
3-127.
Message Buffer Cycle
Freescale Semiconductor
can not be
Eqn. 3-8
Eqn. 3-9
Data.