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IMX6  1588 ENET_REF_CLK on GPIO_16

Question asked by Zhenlei Xie on Apr 28, 2019
Latest reply on Apr 28, 2019 by Wigros Sun

Hi Sir,

   I'm debugging 1588 issues on our imx6solo (P/N: MCIMX6S5EVM10AC) system. RGMII is used on our system. I have configures GPIO_16 as MX6QDL_PAD_GPIO_16__ENET_REF_CLK signal based on the thread from .

   The strange thing is that the GPIO_16 pin will output 50MHz clock after eth0 up. If use "ifconfig eth0 down" command, the 50MHz clock output will disappear. I use "memtool" tool to check the register  (IOMUXC_SW_MUX_CTL_PAD_GPIO16, address 0x020E0214), the values is 0x02, for ENET_REF_CLK.


if (IOMUXC_SW_MUX_CTL_PAD_GPIO16, address 0x020E0214) is changed other value except 0x02, there is no the 50MHz clock output from the GPIO_16 PIN when eth0 up.


   I can't provide refer clock on GPIO_16 pin because it will conflict with the 50MHz output. If there is no extern reference clock, the 1588 can't work. How to fix this issue? Thanks.


Best regards

Zhenlei Xie