mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 159

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

least one of the conditions mentioned above is fulfilled for these message buffers. The transition SA
changes the message buffer states from either Idle to CCSa or from HLck to HLckCCSa. In each case,
these message buffers will be used for null frame transmission in the next slot. A message buffer timing
and state change diagram for null frame transmission from Idle state is given in
A message buffer timing and state change diagram for null frame transmission from HLck state is given
in
If a transmit message buffer is in the CCSa or HLckCCSa state at the start of the transmission slot, a null
frame is transmitted in any case, even if the message buffer is unlocked or committed before the
transmission slot starts. A transmit message buffer timing and state change diagram for null frame
transmission for this case is given in
Since the null frame transmission will not use the message buffer data, the application can lock/unlock the
message buffer during null frame transmission. A transmit message buffer timing and state change
diagram for null frame transmission for this case is given in
Freescale Semiconductor
Figure
HLck
HLck
Idle
3-115.
SA
SA
SA
search[s+1]
search[s+1]
search[s+1]
HLckCCSa
Figure 3-116. Null Frame Transmission from HLck state with unlock
Figure 3-115. Null Frame Transmission from HLck state
Figure 3-114. Null Frame Transmission from Idle state
HLckCCSa
CCSa
slot s
slot s
slot s
HU
Figure
CCSa
MFR4300 Data Sheet, Rev. 3
3-116.
STS
STS
STS
Figure
null frame transmit
HLckCCNf
null frame transmit
null frame transmit
CCNf
CCNf
slot s+1
slot s+1
slot s+1
3-117.
Figure
FlexRay Module (FLEXRAYV2)
SSS
SSS
SSS
3-114.
slot s+2
slot s+2
HLck
Idle
slot s+2
Idle
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