Xilinx CAN FD v2.0 Product Manual page 49

Table 2-35: TXE FIFO TB ID Register (Cont'd)
Bits Name
18:1 ID[17:0]
0 RTR/RRS
TXE FIFO TB* DLC Register (Address Offset + 0x2004, 0x200C ...)
Table 2-36: TXE FIFO TB DLC Register
Bits Name
31:28 DLC
27 FDF
26 BRS
CAN FD v2.0
PG223 December 5, 2018
Control/ Default
Status Value
Extended Message ID.
This field indicates the Extended Identifier.
Status N/A
Valid only for Extended CAN and CAN FD frames.
For Standard CAN and CAN FD frames, writes to this field
should be 0.
Remote Transmission Request.
This bit differentiates between CAN extended data
frames and CAN extended remote frames.
• 1 = Indicates the message frame is a CAN Remote
Status N/A
• 0 = Indicates the message frame is a CAN Data Frame.
For Extended CAN FD frames this bit is transmitted at RRS
position of the frame and must be set as 0.
For Standard CAN and CAN FD frames, writes to this bit
should be 0.
Note:
Control/ Default
Status Value
Data Length Code.
Status N/A
This is the data length code of the control field of the CAN
and CAN FD frame.
Extended Data Length/FD Frame Format.
This bit distinguishes between CAN format and CAN FD
format frames.
Status N/A
• 1 = CAN FD format frame.
• 0 = CAN format frame.
Bit Rate Switch.
The BRS bit decides whether the bit rate is switched inside a
CAN FD format frame or not (provided the BRSD bit is not
set in the MSR register).
• 1 = Bit rate is switched from the standard bit rate of the
Status N/A
Arbitration phase to the preconfigured alternate bit rate
of the Data phase inside a CAN FD frame
• 0 = Bit rate is not switched inside a CAN FD frame.
Note:
to 0.
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Chapter 2: Product Specification
Description
Frame.
There are no CAN FD remote frames.
Description
BRS does not exist in CAN format frames and should be set
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