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Can COL, CRS and RX_ER on MII be unused on STM32F407 ?

Posted on December 17, 2013 at 22:25

We need (don't ask why) to use a PHY which does not have COL, CRS or RX_ER pins.  Can these be tied off to appropriate logic levels on the STM32F407xx we're going to be using and still result in proper operation?

Thanks,

Scott

#stm32 #stm32f407-mii #rx_er
4 REPLIES 4
Posted on December 17, 2013 at 22:54

Pretty shallow pool here, suggest you contact an FAE.

Plan B would be to modify an existing board, or just not configure/connect the pins (AF mux), and try it.

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Posted on December 17, 2013 at 22:58

Thanks, I'll do that!

Scott

derek
Associate II
Posted on May 13, 2014 at 10:55

Scott, did you ever get an answer from STM?   I'm connecting the STM to RMII switch (no need for RX_ER signal because of store-and-forward).   I'm want the RX_ER pins for a another function, but can't really tell from the STM32 datasheet what will happen if an input is not assigned to an alternate function. 

doebber2
Associate II
Posted on October 07, 2014 at 14:06

Hi Scott,

I have the same question. Did you get an answer or have a solution for the ''MII-Lite'' connection??

regards Marc