T2080 MDIC[1:0] Discrepancy

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T2080 MDIC[1:0] Discrepancy

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neoventus
Contributor I

The T2080 reference manual states 187ohms should be used to bias the MDIO lines, while app note AN3940 states 40ohms. Can someone verify 187 is correct?

Thanks

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garymilliorn
NXP Employee
NXP Employee

Also note that MDIC sets the impedance of the DDR MDQ signals, not the EMI MDIO (I know that's not what you meant).

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alexander_yakov
NXP TechSupport
NXP TechSupport

In case of any discrepancy between device data sheet and any other document, please trust device datasheet.

In this case, AN3940 is common appnote for devices with DDR3 controller starting from MPC85xx (note - this appnote is not listed at T2080 documentation page), whereas T2080 device datasheet contains MDIC values specific for this particular processor.


Have a great day,
Alexander

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