RX Message Filtering

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

Document ID
UG1085
Release Date
2022-09-15
Revision
2.3 English

To filter RX messages, configure and enable up to four acceptance filters with acceptance mask, and ID registers to determine whether to store messages in the RXFIFO or to acknowledge and discard them.

Acceptance filtering is performed by the following sequence.

1.The incoming identifier is masked with the bits in the acceptance filter mask register.

2.The acceptance filter ID register is also masked with the bits in the acceptance filter mask register.

3.Both resulting values are compared.

4.If both these values are equal, then the message is stored in the RXFIFO.

5.Acceptance filtering is processed by each of the defined filters. If the incoming identifier passes through any acceptance filter, then the message is stored in the RXFIFO.