SPRACU5C June 2021 – September 2023 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
Series resistors (22 Ω) are recommended for the Ethernet MAC interface signals. Use smallest possible package (0402 or smaller) and place as close to the source. To start with place series resistor (22 Ω) for the TX signals near to the processor pins. For the RX signals the EPHYs internal series resistors can be used. Providing provision for external series resistors (0 Ω) are recommended on the RX signals.
The interrupt output of the Ethernet PHY can be connected to the processor EXTINTn (interrupt) pin. A pullup resistor is recommended for the EXTINTn input close to the processor. When a PCB trace is connected and not being driven actively by an external input, it is recommended to connect the external pullup resistor. This is a fail-safe input.