ColdFire/68K Microcontrollers and ProcessorsのトピックRe: Why External Phy?! https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Why-External-Phy/m-p/202713#M9386 <HTML><HEAD></HEAD><BODY><P>I was thinking the same thing.</P><P>If MCF5225x had a built-in Ethernet PHY, it would be almost perfect for my current application.</P><P>But I have to say that the PHY in MCF5223x has its drawbacks. It's too power-hungry, auto-negotiation is broken, missing automatic MDI/MDI-X detection.</P><P>There must be some cost associated with a built-in Ethernet PHY. Substantial silicon area, could interfere with the ADC, maintaining or licencing a PHY has a cost too. I'm just speculating here, though...</P></BODY></HTML> Sat, 22 May 2010 06:03:08 GMT scifi 2010-05-22T06:03:08Z Why External Phy?! https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Why-External-Phy/m-p/202712#M9385 <HTML><HEAD></HEAD><BODY><P>Please excuse my ignorance:</P><P>&nbsp;</P><P>Why is it that most freescale's MCUs use external PHY instead of internal PHY like the MCF5223x family?</P><P>&nbsp;</P><P>Is it to offer the possibility to connect to means of communications other than Ethernet?</P><P>&nbsp;</P><P>I thank you in advance.</P></BODY></HTML> Sat, 22 May 2010 02:31:52 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Why-External-Phy/m-p/202712#M9385 rdazcal 2010-05-22T02:31:52Z Re: Why External Phy?! https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Why-External-Phy/m-p/202713#M9386 <HTML><HEAD></HEAD><BODY><P>I was thinking the same thing.</P><P>If MCF5225x had a built-in Ethernet PHY, it would be almost perfect for my current application.</P><P>But I have to say that the PHY in MCF5223x has its drawbacks. It's too power-hungry, auto-negotiation is broken, missing automatic MDI/MDI-X detection.</P><P>There must be some cost associated with a built-in Ethernet PHY. Substantial silicon area, could interfere with the ADC, maintaining or licencing a PHY has a cost too. I'm just speculating here, though...</P></BODY></HTML> Sat, 22 May 2010 06:03:08 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Why-External-Phy/m-p/202713#M9386 scifi 2010-05-22T06:03:08Z Re: Why External Phy?! https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Why-External-Phy/m-p/202714#M9387 <HTML><HEAD></HEAD><BODY><P>Good question! &nbsp;I have a couple reasons "why an external PHY?"</P><P>&nbsp;</P><P>An external PHY gives our company the opportunity to provide a Fiber ethernet connection as well as the standard copper ethernet option.</P><P>&nbsp;</P><P>Also, an external PHY gives us the ability to 'ruggedize' the ethernet input hardware. &nbsp;That is we can add circuitry (transorbs etc.) that protects against harsh environments where voltage spikes and transients happen regularly.</P></BODY></HTML> Wed, 26 May 2010 03:20:23 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Why-External-Phy/m-p/202714#M9387 gmnelson 2010-05-26T03:20:23Z Re: Why External Phy?! https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Why-External-Phy/m-p/202715#M9388 <HTML><HEAD></HEAD><BODY><P>Thank you gmnelson</P></BODY></HTML> Thu, 27 May 2010 08:24:54 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Why-External-Phy/m-p/202715#M9388 rdazcal 2010-05-27T08:24:54Z