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TMS570LC4357: SGMII interface

Part Number: TMS570LC4357
Other Parts Discussed in Thread: DP83TC811R-Q1, DP83TC811S-Q1

Team,

My customer has a TMS570LC4357 based development.

They have the following question,

The module should have an optional interface 100BASE-T1. TI offers 2 blocks: DP83TC811R-Q1 and DP83TC811S-Q1.

Apart from the SGMII interface on DP83TC811S-Q1, are the two components otherwise technically the same?
Are there differences in availability and prices?
Can you give me a recommendation which of the two components is better planned / used?

Thanks,

Needhu