how to connect optical SFP module to imx28 MCU?

[Radist]

Hello gentleman, does anybody know how to connect optical SFP module (125MBit) to imx287 MCU with MII MAC? i found, that standard PHY LAN8720 can't be used for that, so looks like i need special PHY. There are not so many information about it in the google at all...

Thanks for any info,

Regards, Sergii

[Yuri]

  As known Ethernet is supported under different media, in particular

there is Fiber Interface in 100BASE-FX.

Please look at section 5.2.1.2 (Fiber Interface) of classical transceiver LXT971A.

< http://cortina-systems.com/products/download/398 >

General information may be found here :

< http://cortina-systems.com/products/download/165 >

  So, two solutions may be considered when using i.MX28 ENET with optic media :

1) special PHY(+Fiber Optic Transceiver) between MAC (MII) and optic media ;

2) media converter between electrical and optic media.

Note, the LXT971A, mentioned above, supports both standards 100BASE-FX

and 100BASE-TX.

As for media converters, please take a look at the following :  

< http://www.perle.com/products/SFP-Media-Converter.shtml?utm_source=google&utm_medium=cpc&utm_campaig... >

Another (on board chip) approach is as following :

< http://www.digchip.com/datasheets/parts/datasheet/028/AL211-pdf.php >

[weidong_sun]

Hello,Sergii,

    The following is Mapping of MII signals, and attachment is schematic of a MII PHY named  LAN8700. you can refter to them.

regards,

Weidong

[Radist]

Hello Weidong,

thank you for answer!

I forgot to mention, that i am using 100 Base FX SFP, optical module, and it doesn't work with normal PHY.. have tried it with LAN8720...

Do you have expirience with optical modules?

--

Best regards,

Sergii

[weidong_sun]

Hello,Sergii,

     Is the PHY you are using is MII 100M ? LAN8720 is RMII, if you want to use MII , you can select LAN8700 or LAN8710 PHY.

regards,

Weidong