topic Re: RMII REFCLKI_3 connecting pin on MK64FN in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/RMII-REFCLKI-3-connecting-pin-on-MK64FN/m-p/960687#M55027 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>As it is showed in your picture, both REFCLK_I and FECn_TXCLK are input pins. The K64 RMII clock source can be EXTAL clock or ENET_1588_CLKIN selected via SIM_SOPT2[RMIISRC].</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_1.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/90939iD86E434D3F630CED/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P><P></P><P>You can use one of these pin. It depend on how you design your system. Please also refer to FRDM-K64F schematic. It use EXTAL0 pin, the red path in the picture.</P><P></P><P>Regards,</P><P>Jing</P></BODY></HTML> Thu, 11 Jul 2019 03:04:48 GMT jingpan 2019-07-11T03:04:48Z RMII REFCLKI_3 connecting pin on MK64FN https://community.nxp.com/t5/Kinetis-Microcontrollers/RMII-REFCLKI-3-connecting-pin-on-MK64FN/m-p/960686#M55026 <HTML><HEAD></HEAD><BODY><P>I use MK64FN1M0VLQ12 and KSZ8863RLL chip to realize the Ethernet function.</P><P></P><P>The pin REFCLI_3 on the chip KSZ8863RLL is for RMII reference clock.&nbsp;<STRONG>Which pin should it connect on the MK64FN1M0VLQ12?</STRONG></P><P></P><P>For MCF54452, we can find the related connecting pin.</P><P></P><P></P><P><STRONG><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_2.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/90749i6FD0AD11B106C287/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_2.png" alt="pastedImage_2.png" /></span></STRONG></P><P></P><P></P><P></P></BODY></HTML> Wed, 10 Jul 2019 01:57:18 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/RMII-REFCLKI-3-connecting-pin-on-MK64FN/m-p/960686#M55026 johnsonzhang1 2019-07-10T01:57:18Z Re: RMII REFCLKI_3 connecting pin on MK64FN https://community.nxp.com/t5/Kinetis-Microcontrollers/RMII-REFCLKI-3-connecting-pin-on-MK64FN/m-p/960687#M55027 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>As it is showed in your picture, both REFCLK_I and FECn_TXCLK are input pins. The K64 RMII clock source can be EXTAL clock or ENET_1588_CLKIN selected via SIM_SOPT2[RMIISRC].</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_1.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/90939iD86E434D3F630CED/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P><P></P><P>You can use one of these pin. It depend on how you design your system. Please also refer to FRDM-K64F schematic. It use EXTAL0 pin, the red path in the picture.</P><P></P><P>Regards,</P><P>Jing</P></BODY></HTML> Thu, 11 Jul 2019 03:04:48 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/RMII-REFCLKI-3-connecting-pin-on-MK64FN/m-p/960687#M55027 jingpan 2019-07-11T03:04:48Z