MPC5748C FlexCan CANFD Maximum baud rate of a data segment

[xiha]

Now I want to configure baud rate of a data segment,I use 8 FlexCan(Can 0 ~ Can 7) and my project is based on Example_MPC5748G_FlexCAN_FD_TX_RX_test_S32DS_21. If i configure 40K, a lot of data will be lost. I find  PE clock of FlexCan is 40MHz, Is it because of this clock that this problem is caused??? So the maximum baud rate of the data segment is 20K if i use 8 FlexCan???

sample site			Propagation segment	Phase segment 1	Phase segment 2	Prescaler Division Factor	Resync jump width
80%	arbitration segment bitrate	500K	7	6	3	3	1
80%	data segment bitrate	4000K	5	1	1	0	1

[PetrS · Accepted solution]

Hi,

max bitrate is about 8Mbps, you can refer to chapter 43.5.10 Clock domains and restrictions of the RM for more info. For sure this bitrate must be supported by used CAN transceiver. For higher bitrates (>4MHz) enabling TDC would be needed.
For you issue, check if any error is detected that can point to root cause (bit timing, PHY issues, etc)...
If just data are lost, I guess on receing side, it can simply show that you are not able to handle/process received messages within MBs in time over all used FlexCAN modules. Check a processing time.

BR, Petr 

[xiha]

OK，i will check it,thanks for you.^-^