https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF54418CMJ250-2-RMII-MODE-DESIGN/m-p/1834178#M14516 <P>Hi Luna,</P> <P>Unfortunately, there is no dedicated document for ColdFire Ethernet RMII layout guideline. I would recommend customer to refer <A href="https://www.nxp.com/docs/en/application-note/AN13335.pdf" target="_self">AN13335</A>&nbsp;PCB design guideline for Auto Ethernet , especially chapter&nbsp;2.1.2 Routing and trace distance.</P> <P>Wish it helps.</P> <P>Mike</P> Mon, 25 Mar 2024 03:16:04 GMT Hui_Ma 2024-03-25T03:16:04Z https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF54418CMJ250-2-RMII-MODE-DESIGN/m-p/1833547#M14514 <P>基于MCF54418CMJ250这款芯片，如果百兆网使用RMII模式，应该如何设计。谢谢。<BR /><BR />目前，我们使用的50MHz的时钟是外部晶振，然后通过一个时钟buffer，输出两路50MHz时钟，分别供给MCF54418（MAC）和两颗TI的DP83848（PHY）。当前设计50MHz时钟到MAC和到PHY的走线距离未做等长处理。<BR /><BR />下面是MCF54418和外部时钟的具体线路图，我们使用了两路RMII网口。<BR /><BR /></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="luna_liang_0-1711095232754.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/269922iB52D19E226501C43/image-size/medium?v=v2&amp;px=400" role="button" title="luna_liang_0-1711095232754.png" alt="luna_liang_0-1711095232754.png" /></span></P><P>&nbsp;</P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="luna_liang_1-1711095232771.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/269923i181CD73AED30DA01/image-size/medium?v=v2&amp;px=400" role="button" title="luna_liang_1-1711095232771.png" alt="luna_liang_1-1711095232771.png" /></span></P><P>&nbsp;</P> Fri, 22 Mar 2024 08:14:01 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF54418CMJ250-2-RMII-MODE-DESIGN/m-p/1833547#M14514 luna_liang 2024-03-22T08:14:01Z https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF54418CMJ250-2-RMII-MODE-DESIGN/m-p/1834178#M14516 <P>Hi Luna,</P> <P>Unfortunately, there is no dedicated document for ColdFire Ethernet RMII layout guideline. I would recommend customer to refer <A href="https://www.nxp.com/docs/en/application-note/AN13335.pdf" target="_self">AN13335</A>&nbsp;PCB design guideline for Auto Ethernet , especially chapter&nbsp;2.1.2 Routing and trace distance.</P> <P>Wish it helps.</P> <P>Mike</P> Mon, 25 Mar 2024 03:16:04 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF54418CMJ250-2-RMII-MODE-DESIGN/m-p/1834178#M14516 Hui_Ma 2024-03-25T03:16:04Z