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About the amplitude of FEC_TX_CLK(REF_CLK) on i.MX25 FEC

Question asked by yuuki on Jul 28, 2015
Latest reply on Aug 3, 2015 by Yuri Muhin

Dear all,

 

We use i.MX257 in our system.
And the RMII I/F of i.MX25 is used.

 

When Drive Strength on the device side is made small, the amplitude of FEC_TX_CLK(REF_CLK) becomes the 4Vpp degree.
When Drive Strength on the device side is made big, the amplitude of FEC_TX_CLK becomes the 5.2Vpp degree.

 

We want to know the amplitude range that FEC_TX_CLK can allow.
(Min/Max Value)

 

May I have advice?

 

Best Regards,
Yuuki

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