LPC54S018J4MET180 Ethernet doesn't work

xiufengxing — Tue, 12 Sep 2023 08:13:14 GMT

Hi, I am currently debugging the Ethernet of the MCU LPC54S018J4MET180 with RMII interface PHY, but it doesn't work ,and i found the ENET_RX_CLK (B5 pin)is floating, is it necessary to connect this pin with the PHY's REFCLOCK? is there any way to make it work when ENET_RX_CLK is floating? thanks.

Re: LPC54S018J4MET180 Ethernet doesn't work

xiangjun_rong — Wed, 13 Sep 2023 03:11:11 GMT

Hi,

I copy the screenshot of the schematics of LPC54S018-EVK board, the crystal Y1 generates 25MHz clock with LAN8720A internal OSC circuit, with internal PLL, the LAN8720A outputs 50MHz clock to the pin 14 of LAN8720A as REFCLKO clock signal, which is connected to PIO4_14 ENET_RX_CLK signal of LPC54018 with 180 pins package.

In conclusion, the PIO4_14 ENET_RX_CLK signal of LPC54018 must be connected to a 50MHz clock from ethernet PHY so that they can synchronize.

Hope it can help you

XiangJun Rong

LPC MicrocontrollersのトピックLPC54S018J4MET180 Ethernet doesn't work

LPC54S018J4MET180 Ethernet doesn't work

Re: LPC54S018J4MET180 Ethernet doesn't work