KSZ9897A Port 7 Accessible via MDIO/MDC?
I have a microcontroller (with an internal MAC) connected using MII to Port 7 of a KSZ9897A switch. Port 7 is configured as an external PHY, and I would like to access the PHY using the MIIM interface for basic setup to take advantage of some existing code for similar switch configuration.
While I can access ports 1-5 with MDIO/MDC (e.g., reading the ID), I get no port 7 response. While I couldn't find it explicitly in the datasheet/manual, I'm starting to suspect the KSZ9897A doesn't support MIIM on port 7 (and probably port 6). Is this is a correct assumption? Is SPI or I2C the only way to access ports 6-7?