| Electronics > Projects, Designs, and Technical Stuff |
| LAN8720 ETH PHY Activity LED indicating only inbound traffic? |
| (1/1) |
| Yansi:
Hello, just started tinkering with ETHernet, now completed my first hello world using a LAN8720 ETH PHY (Datasheet). What I found interesting (and to be honest, very annoying) is that the activity LED blinks only on inbound (receive) traffic. When I for example send a packet every second, the LED does not blink, stays lit. I think this is beyond stupid, as if I wanted to use the PHY in a device, for example a UDP streaming device, that produces 99% traffic only outbound (transmit), the LED would not indicate absolutely anything. Datasheet of the PHY seems to confirm this stupid behavior of the LED: Section 3.8, quoute: "The LED1 output is driven active whenever the device detects a valid link, and blinks when CRS is active (high) indicat-ing activity" Why is that? Is it normal the link/activity LED blinks only on received data (CRS, carrier sense)? |
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