Xilinx CAN FD v2.0 Product Manual page 57

7. Both resulting values are compared.
8. If both these values are equal and the matched filter index is less than or equal to the
RXFP field, the message is stored in RX FIFO-0.
9. Else, if both these values are equal and the matched filter index is greater than the RXFP
field, the message is stored in RX FIFO-1.
The ID match process is a sequential process. It starts from the lowest enabled filter and
stops at the first match. Therefore, if an incoming message fulfills condition 4 but RX FIFO-0
is full, the message is dropped (irrespective of RX FIFO-1 status) and RX FIFO-0 overflow is
indicated.
Similarly, if the incoming message fulfills condition 5 and RX FIFO-1 is full, the message is
dropped (irrespective of RX FIFO-0 status) and RX FIFO-1 overflow is indicated. See
Figure 2-1 to Figure 2-4
X-Ref Target - Figure 2-1
Incoming Message
FPj = Filter Mask Pair (j = 0,1...31)
Receive Filter Partition (RXFP) = i
X-Ref Target - Figure 2-2
Incoming Message
FPj = Filter Mask Pair (j = 0,1...31)
Receive Filter Partition (RXFP) = i
CAN FD v2.0
PG223 December 5, 2018
for details.
FP0
Match = Yes
Figure 2-1: Normal Operation (RX FIFO-0)
FP0
RX FIFO 0
Figure 2-2: Normal Operation (RX FIFO-1)
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Chapter 2: Product Specification
FPx FPi
RX FIFO 0
FPi
Match = Yes
FP31
RX FIFO 1
X21313-081618
FP31
FPx
RX FIFO 1
X21310-081518 X21311-081518 X21311-081518 X21312-081618
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