RM0440 Rev 4 1971/2126
RM0440 FD controller area network (FDCAN)
2008
44.3.7 FDCAN Tx Event FIFO element
Each element stores information about transmitted messages. By reading the Tx Event
FIFO the Host CPU gets this information in the order the messages were transmitted. Status
information about the Tx Event FIFO can be obtained from register TXEFS.
2. When RTR = 1, the FDCAN transmits a remote frame according to ISO11898-1, even if CCCR.FDOE
enables the transmission in CAN FD format.
3. Bits ESI, FDF, and BRS are only evaluated when CAN FD operation is enabled CCCR.FDOE = 1. Bit BRS
is only evaluated when in addition CCCR.BRSE = 1.
Table 400. Tx Event FIFO element
Bit 31 24 23 16 15 8 7 0
E0 ESI XTD RTR ID[28:0]
E1 MM[7:0] ET[1:0] EDL BRS DLC[3:0] TXTS[15:0]
Table 401. Tx Event FIFO element description
Field Description
E0 Bit 31
ESI
Error state indicator
– 0: Transmitting node is error active
– 1: Transmitting node is error passive
E0 Bit 30
XTD
Extended identifier
– 0: 11-bit standard identifier
– 1: 29-bit extended identifier
E0 Bit 29
RTR
Remote transmission request
– 0: Transmit data frame
– 1: Transmit remote frame
E0 Bits 28:0
ID[28:0]
Identifier
Standard or extended identifier depending on bit XTD. A standard identifier has to be
written to ID[28:18].
E1 Bits 31:24
MM[7:0]
Message marker
Copied from Tx Buffer into Tx Event FIFO element for identification of Tx message
status.
E1 Bits 23:22
EFC
Event type
– 00: Reserved
– 01: Tx event
– 10: Transmission in spite of cancellation (always set for transmissions in DAR
mode)
– 11: Reserved
E1 Bit 21
EDL
Extended data length
– 0: Standard frame format
– 1: FDCAN frame format (new DLC-coding and CRC)
E1 Bit 20
BRS
Bit rate switching
– 0: Frame transmitted without bit rate switching
– 1: Frame transmitted with bit rate switching
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