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Marvell Ethernet Switch: cascading devices via RGMII

Former Member

Hi

I have a design using two Marvell 88E6352 Gb Ethernet switches. They are connected together via RGMII (Mac to mac rather than mac to phy).

Can I use this switch to switch interface to cascade the switches to act as one? I think it is more usual to use SGMII for this but believe a no phy chip to chip interface to still be valid.

I can see the clocks working from each device but the data lines are inactive.

I have tried setting Distributed Switch Architecture on for these ports, forcing the link and speed settings etc – but the data lines never move!

I am using port 5 of the device and have confirmed it to be in RGMII mode and enabled.

Any guidance would be helpful.

Steve