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LPC4357 and KSZ8863 Phy: access to Advanced Control Registers

Question asked by Johan Borkhuis on Oct 2, 2017



I am working on a design which connects the KSZ8863 Phy to the LPC4257 using the standards RMII interface. But the phy also includes some additional registers, and to access these they included the SMI interface, which is identical to the MII interface, but with different (non-standard) opcodes in the MII Management frame format: instead of read (10) and write (01) the opcode must be 00 both for read and write.


Is it possible to instruct the ethernet module in the LPC4357 to send these non-standard opcodes, so I can access the additional registers in the phy?



     Johan Borkhuis