FD controller area network (FDCAN) RM0440
1970/2126 RM0440 Rev 4
T1 Bit 23
EFC
Event FIFO control
– 0: Don’t store Tx events
– 1: Store Tx events
T1 Bit 21
FDF
FD format
– 0: Frame transmitted in Classic CAN format
– 1: Frame transmitted in CAN FD format
T1 Bit 20
BRS
(3)
Bit rate switching
– 0: CAN FD frames transmitted without bit rate switching
– 1: CAN FD frames transmitted with bit rate switching
T1 Bits 19:16
DLC[3:0]
Data length code
– 0 - 8: Classic CAN + CAN FD: received frame has 0-8 data bytes
– 9 - 15: Classic CAN: received frame has 8 data bytes
– 9 - 15: CAN FD: received frame has 12/16/20/24/32/48/64 data bytes
T2 Bits 31:24
DB3[7:0]
Data Byte 3
T2 Bits 23:16
DB2[7:0]
Data Byte 2
T2 Bits 15:8
DB1[7:0]
Data Byte 1
T2 Bits 7:0
D[7:0]
Data Byte 0
T3 Bits 31:24
DB7[7:0]
Data Byte 7
T3 Bits 23:16
DB6[7:0]
Data Byte 6
T3 Bits 15:8
DB5[7:0]
Data Byte 5
T3 Bits 7:0
DB4[7:0]
Data Byte 4
...
...
Tn Bits 31:24
DBm[7:0]
Data Byte m
Tn Bits 23:16
DBm-1[7:0]
Data Byte m-1
Tn Bits 15:8
DBm-2[7:0]
Data Byte m-2
Tn Bits 7:0
DBm-3[7:0]
Data Byte m-3
1. The ESI bit of the transmit buffer is OR-ed with the error passive flag to decide the value of the ESI bit in
the transmitted FD frame. As required by the CAN FD protocol specification, an error active node may
optionally transmit the ESI bit recessive, but an error passive node always transmits the ESI bit recessive.
Table 399. Tx Buffer element description (continued)
Field Description
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