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> From: Roland
> Sent: Friday, March 1, 2024 9:55 AM
> To: dev@nuttx.apache.org
> Subject: Re: Ethernet direct RMII connection
>
> Hi Alan,
>
> Thanks for this reminder.
>
> I am using RMII, as STM32F7 can only support up to 100MHz data rate and do
Rolan,
Have a look in the imx8 manual you may be able to source the clock from that
MAC.
David
-Original Message-
From: Roland
Sent: Friday, March 1, 2024 9:55 AM
To: dev@nuttx.apache.org
Subject: Re: Ethernet direct RMII connection
Hi Alan,
Thanks for this reminder.
I am using
Hi Alan,
Thanks for this reminder.
I am using RMII, as STM32F7 can only support up to 100MHz data rate and do not
have any GMII interface.
On imx8m side, it actually will be “downgraded” to RMII as well.
/Roland
> On Mar 1, 2024, at 9:31 PM, Alan C. Assis wrote:
>
> Hi Roland,
>
> I
Hi Roland,
I think the page I sent earlier has more info about MII, RMII, RGMII, etc
that you need to know before attempting to do it. Let me put here for
clarification:
"There are variants of the MII (GMII; RMII; SGMII; RGMII...) interface for
connecting MACs to PHYs or MACs to MACs, in some of
@Alan,
Thanks for the hints.
From your message I will assume that this direct mode is not supported by
default, so I need to start looking into it.
I already have a basic hardware setup includes a STM32F7 custom board and an
imx8m custom board, all prototypes. So it would be easier for me to
RMII just means it uses fewer I/O pins from the MCU as compared to MII. I
don't remember the details either but it's possible that some chips support
RMII and not MII because they don't have the additional I/O pins.
Tiva-C (arch/arm/src/tiva) supports RMII (the chip has the built-in MAC and
PHY)
Hi Roland,
We had a discussion about it a few months ago!
We know it is possible, but nobody until now tried to do it.
Basically you will need RMII support on both chips, I don't remember the
details why MII will not work (or will be more difficult to work)
There is a discussion about it here,
