MCU modifies network hardware driver (PHY chip replacement)

1. Compare the schematic diagram , Check the website demo The board connects the pin to the current phy Chip difference

There was a problem before , primary demo Yes RXNN Pin , It seems to be used for error detection , But the matched chip does not have this pin , Then the pin is always verified , The way to do this is to reuse this pin as a common io

2. Compliance with agreement , General protocols are generic

3. Reset pin , Generally, the reset pin needs to be pulled high , But one thing to note is that it's better to lower it first, then delay for a while and then raise it , There are basic flat changes

4.PHY Address , It's usually 5 position , quite a lot PHY The address is from the schematic diagram led The high and low levels of several pins of the lamp determine , Most of them 0 It is a broadcast address, that is, it can be adapted to any phy

5.MAC The first cannot be 00, Actually all ff It's a broadcast address

6. Switch phy The chip supports multiple network ports , Note that there is a control pin , Pull up to get pull-down conduction