Fdcan Tx Event Fifo Element; Table 209. Tx Event Fifo Element; Table 210. Tx Event Fifo Element Description - ST STM32G0 1 Series Reference Manual

FD controller area network (FDCAN)
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.
36.3.7

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.
Bit 31
E0 ESI
E1
Field
E0 Bit 31
ESI
E0 Bit 30
XTD
E0 Bit 29
RTR
E0 Bits 28:0
ID[28:0]
E1 Bits 31:24
MM[7:0]
E1 Bits 23:22
EFC
E1 Bit 21
EDL
E1 Bit 20
BRS
1224/1390

Table 209. Tx Event FIFO element

24 23
XTD RTR
MM[7:0]

Table 210. Tx Event FIFO element description

Error state indicator
– 0: Transmitting node is error active
– 1: Transmitting node is error passive
Extended identifier
– 0: 11-bit standard identifier
– 1: 29-bit extended identifier
Remote transmission request
– 0: Transmit data frame
– 1: Transmit remote frame
Identifier
Standard or extended identifier depending on bit XTD. A standard identifier has to be
written to ID[28:18].
Message marker
Copied from Tx Buffer into Tx Event FIFO element for identification of Tx message
status.
Event type
– 00: Reserved
– 01: Tx event
– 10: Transmission in spite of cancellation (always set for transmissions in DAR
mode)
– 11: Reserved
Extended data length
– 0: Standard frame format
– 1: FDCAN frame format (new DLC-coding and CRC)
Bit rate switching
– 0: Frame transmitted without bit rate switching
– 1: Frame transmitted with bit rate switching
RM0444 Rev 5
ID[28:0]
ET[1:0] EDL BRS DLC[3:0]
Description
RM0444
16 15 8 7
TXTS[15:0]
0