mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 155

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

3.4.6.2.3
Application Transitions
The application transitions can be triggered by the application using the commands described in
Table
Control, Status Registers
command is executed immediately. If the command is ignored, it must be issued again.
The enable and disable commands issued by writing ‘1’ to the trigger bit MBCCSRn.EDT. The transition
that will be triggered by each of these command depends on the current value of the status bit
MBCCSRn.EDS. If the command triggers the disable transition HD and the message buffer is in one of
the states CCSa, HLckCCSa, CCMa, HLckCCMa, CCNf, HLckCCNf, or CCTx, the disable transition
has no effect (command is ignored) and the message buffer state is not changed. No notification is given
to the application.
The lock and unlock commands issued by writing ‘1’ to the trigger bit MBCCSRn.LCKT. The transition
that will be triggered by each of these commands depends on the current value of the status bit
MBCCSRn.LCKS. If the command triggers the lock transition HL and the message buffer is in the state
CCTx, the lock transition has no effect (command is ignored) and message buffer state is not changed. In
this case, the message buffer lock error flag LCK_EF in the
Freescale Semiconductor
HLckCCMa
HLckCCSa
Transition
HLckCCNf
CCMa
CCSa
CCSu
CCTx
State
CCNf
3-92. The application issues the commands by writing to the
HD
HE
Message Buffer Transitions
Table 3-91. Single Transmit Message Buffer State Description (Sheet 2 of 2)
EDS
MBCCSRn
1
1
1
1
1
1
1
1
Table 3-92. Single Transmit Message Buffer Application Transitions
MBCCSRn.EDT:= 1
Command
LCKS
(MBCCSRn). Only one command can be issued with one write access. Each
0
1
0
1
0
1
0
0
Access Region
Appl.
MSG
MSG
MSG
–
–
–
–
–
MFR4300 Data Sheet, Rev. 3
Module
CM
NF
NF
TX
TX
MBCCSRn.EDS = 0 Application triggers message buffer enable.
MBCCSRn.EDS = 1 Application triggers message buffer disable.
–
–
–
Condition
Slot Assigned - Message buffer assigned to next static slot.
Ready for Null Frame transmission.
Locked and Slot Assigned - Applications access to data, control,
and status.Message buffer assigned to next static slot
Null Frame Transmission
Header is used for null frame transmission.
Locked and Null Frame Transmission - Applications access to
data, control, and status. Header is used for null frame transmission.
Message Available - Message buffer is assigned to next slot and
cycle counter filter matches.
Locked and Message Available - Applications access to data,
control, and status. Message buffer is assigned to next slot and cycle
counter filter matches.
Message Transmission - Message buffer data transmit. Payload
data from buffer transmitted
Status Update - Message buffer status update. Update of status
flags, the slot status field, and the header index.
CHI Error Flag Register (CHIERFR)
Message Buffer Configuration,
Description
Description
FlexRay Module (FLEXRAYV2)
is set.
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