ETH: anybody used KSZ8863RLL?

LCE · ‎2024-02-28

Heyho,

until now I only used STM32 with the LAN8742, in a few weeks I'll get my 2nd custom board, but this time with the "dual" PHY KSZ8863RLL.

It's connected via RMII, for setup MDIO (and optionally I2C for the registers not accessible via MDIO).

Are there any known issues or "pitfalls" with this PHY?

Thanks in advance,
LCE

PS: interesting that there is no "ETH" label... :D

LCE · ‎2024-08-12

I have my board with STM32H733, KSZ8863RLL, LAN9512 up and running.

Here's the most important advice:

a) use internal RMII clock

b) use I2C (or SPI) - which is a must for a)

MDIO only allows access to a few basic registers (as already mentioned by Pavel), but to enable internal RMII clock (recommended by datasheet), a register only accessible via I2C / SPI must be written. (Bad design IMO).

View solution in original post

Andrew Neil · ‎2024-02-28

You mean this: https://www.microchip.com/en-us/product/lan8742 ?

and this: https://www.microchip.com/en-us/product/ksz8863 ?

As they're both Microchip products, have you asked Microchip for any guidance in moving from one to the other?

Do they have a migration guide?

Or on the Microchip Ethernet forum:

https://forum.microchip.com/s/sub-forums?&subForumId=a553l000000J2qRAAS&forumId=a553l000000J2q6AAC&subForumName=Ethernet&forumName=TCP%20%2F%20IP&page=1&offset=0

Andrew Neil · ‎2024-02-28

@LCE wrote:
PS: interesting that there is no "ETH" label... :D

I guess that would go under 'Interface and connectivity ICs':

https://community.st.com/t5/interface-and-connectivity-ics/bd-p/interface-connectivity-ics-forum

But do ST have any such chips?

LCE · ‎2024-02-28

> But do ST have any such chips?

No PHYs from ST.

That's why I ask here, in hope some other STM32 user has used the KSZ8863.

The Microchip forum / Ethernet feels like mostly dead.

LCE · ‎2024-02-28

They have a migration guide between the KSZ8863 and another dual PHY.

Andrew Neil · ‎2024-02-28

Just noticed:

LCE · ‎2024-02-28

Yes, I already found these, one thread was started by me...

And I'm not too bad at googling! ;)

Andrew Neil · ‎2024-02-28

@LCE wrote:
The Microchip forum / Ethernet feels like mostly dead.

You can always contact Microchip Support direct: https://microchip.my.site.com/s/

https://www.microchip.com/en-us/support/design-help/client-support-services#

LCE · ‎2024-02-28

I'd rather have some insights from another STM32 / PHY user.

Andrew Neil · ‎2024-02-28

The products are agnostic to what microcontroller is used - a SAM would see the same as an STM.

Microchip would be able to tell you about the differences between their products.