FlexRay Communication Controller (FLEXRAY)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
Freescale Semiconductor
30-151
Preliminary
The transmission of a frame in the dynamic segment is determined by the availability of data and the match
of the cycle counter filter of the transmit message buffer.
30.7.6.3.1
Transmit Data Not Available
If transmit data are
not available
, i.e. the transmit buffer is not committed MBCCSR
t
[CMT]=0 and/or
locked MBCCSR
t
[LCKS]=1,
c) for the cycles in the set {4n}, which is assigned to both buffers, the receive buffer will be found
and the node can receive data, and
d) for the cycles in the set {4n+2}, which is assigned to the receive buffer only, the receive buffer
will be found and the node can receive data.
The receive cycles are shown in
Figure 30-145. Transmit Data Not Available
30.7.6.3.2
Transmit Data Available
If transmit data are
available,
i.e. the transmit buffer is committed MBCCSR
t
[CMT]=1 and not locked
MBCCSR
t
[LCKS]=0,
e) for the cycles in the set {4n}, which is assigned to both buffers, the transmit buffer will be found
and the node transmits data.
f) for the cycles in the set {4n+2}, which is assigned to the receive buffer only, the receive buffer
will be found and the node can receive data.
The receive and transmit cycles are shown in
Figure 30-146. Transmit Data Not Available
0
RX
1
2
RX
3
4
RX
5
6
RX
7
59
60
RX
61
62
RX
8
RX
63
0
TX
1
2
RX
3
4
TX
5
6
RX
7
59
60
TX
61
62
RX
8
TX
63
