Series Termination Resistor

[johnnynguyen]

I am connecting the i.MX6UL device with an FPGA through an RMII interface. Since this is a high speed transmission line which needs a series termination resistor. I assume maximum drive strength has typ impedance value is 23Ohm based on the datasheet, and it would need a 30Ohm resistor in series to die out the reflected voltage at load. Any recommendation for this topic?

[Yuri]

Hello,

  Please look at some comments below regarding the issue.

1.

  Customers can refer to section 3.5.2 (High speed signal routing recommendations) of Hardware Development Guide for the i.MX 6UL.

https://www.nxp.com/docs/en/user-guide/IMX6ULHDG.pdf  

2.

  IMX 6UL EVK may be used as an example.

https://www.nxp.com/downloads/en/schematics/MCIMX6UL-EVK_DESIGNFILES.zip 

i.MX6UltraLite Evaluation Kit|NXP 

3.

  Customers can apply modeling, using IBIS files.

i.MX 6UltraLite Applications Processor|NXP 

Have a great day,
Yuri

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