PXN20RM Datasheet, PDF (726/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

FlexRay Communication Controller (FlexRAY)
Table 26-105. Receive Message Buffer Update
vSS!ValidFrame
vRF!Header!NFIndicator
Update description
1
1
Valid non-null frame received.
- Message Buffer Data Field updated.
- Frame Header Field updated.
- Slot Status Field updated.
- DUP:= 1
- DVAL:= 1
- MBIF:= 1
1
0
Valid null frame received.
- Message Buffer Data Field not updated.
- Frame Header Field not updated.
- Slot Status Field updated.
- DUP:= 0
- DVAL not changed
- MBIF:= 1
0
x
No valid frame received.
- Message Buffer Data Field not updated.
- Frame Header Field not updated.
- Slot Status Field updated.
- DUP:= 0
- DVAL not changed.
- MBIF:= 1, if the slot was not an empty dynamic slot.
Note: An empty dynamic slot is indicated by the following frame and slot
status bit values:
vSS!ValidFrame = 0 and vSS!SyntaxError = 0 and
vSS!ContentError = 0 and vSS!BViolation = 0.
NOTE
If the number of the last slot in the current communication cycle on a given
channel is n, then all receive message buffers assigned to this channel with
MBFIDRn[FID] > n will not be updated at all.
When the receive message buffer update has finished the status updated transition SU is triggered, which
changes the buffer state from CCSu to Idle. An example receive message buffer timing and state change
diagram for a normal frame reception is given in Figure 26-129.
Idle
BS
MT ^start
search[s+1]
MT ^start
CCBs
slot s
SLS
CCRx
message receive to receive shadow buffer
slot s+1
Figure 26-129. Message Reception Timing
SSS SU
CCSu ^Idle
MT ^start
slot s+2
26-112
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor