mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 175

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

An example of a streaming commit mode state change diagram is given in
both the commit and the transmit side do not contain valid message data and the application provides two
messages. The message buffer does not match the next slot.
Immediate Commit Mode
The intention of the immediate commit mode is to transmit the latest data provided by the application. This
implies that it is not guaranteed that each provided message will be transmitted at least once.
The immediate commit mode is configured by setting the message buffer commit mode bit MCM in the
Message Buffer Configuration, Control, Status Registers
In this mode, the internal message transfer from the commit side to the transmit side is started for one
double transmit message buffer when all of the following conditions are fulfilled
It is not checked whether the transmit side contains no valid message data or valid message data were
transmitted at least once. If message data are valid and not transmitted, they may be overwritten.
An example of a streaming commit mode state change diagram is given in
both the commit and the transmit side do not contain valid message data, and the application provides two
messages and the first message is gets overwritten. The message buffer does not match the next slot.
Freescale Semiconductor
1. the commit side is in the Idle state
2. the commit site message data are valid, i.e. MBCCSR[2n].CMT = 1
3. the transmit side is in one of the states Idle, CCSa, or CCMa
Idle
Idle
HL
HL
search[s+1]
search[s+1]
HLck
HLck
Idle
Idle
Figure 3-125. Internal Message Transfer in Streaming Commit Mode
Figure 3-126. Internal Message Transfer in Immediate Commit Mode
HU
HU
slot s
slot s
Idle
Idle
IS
IS
CCITx
CCITx
CCITx
CCITx
MFR4300 Data Sheet, Rev. 3
IE
IE
Idle
Idle
HL
(MBCCSRn).
HL
HLck
HLck
Idle
slot s+1
slot s+1
HU
HU
overwrites non-transmitted message
Idle
Idle
Figure
Figure
no internal message transfer,
until message transmitted
internal message transfer
IS
FlexRay Module (FLEXRAYV2)
3-125. In this example,
3-126. In this example,
CCITx
CCITx
Idle
IE
slot s+2
Idle
Idle
slot s+2
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