Connecting two ethernet PHY's (KSZ8051RNLU) in RMII back toback configuration

Question

I would like to to connect the KSZ8051RNLU in a loopback configuration with itself, I have read that this is possible with other PHY's. Does the KSZ8051RNLU have this capability? Will it auto-configure itself if it can do this?

Has anyone does this before and does the below diagram look correct?

schematic

^{simulate this circuit – Schematic created using CircuitLab}

score 1 · Accepted Answer · answered Aug 04 '23 at 22:37

Actually that is not a loopback configuration as it means connecting a single PHY to itself.

I assume you mean you want to connect two PHYs in back-to-back configuration to make an Ethernet repeater.

The data sheet boasts you can connect two PHYs in back-to-back configuration to make a copper repeater.

Section 3.4 of the datasheet has a connection diagram how to connect them, and how to set the configuration straps for this mode.

(Disclaimer, I've not used this PHY in PHY-to-PHY mode).

I'm going to use it for a loopback test – Voltage Spike Aug 05 '23 at 03:51 — Voltage Spike, Aug 05 '23 at 03:51

Connecting two ethernet PHY's (KSZ8051RNLU) in RMII back toback configuration

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