KSZ8794 4-port ETH switch to MX8M

[amsol]

Hi All,

I am unsure if how to wire Phy to a i.MX8M procc in RGMii mode of operation.

I am using a SOM from Variscite MX8M as the procc module.

The module has its PHY removed, with pins exposed as per the attached schematic.

Attached are the 2 schematic files.

Particularly my concern of the J1.1 on sch > main  >> ENET_PHY_REFR_CLK

 Does it need to connect somewhere to the PHY ?

Res strappings A>>E on PHY sch?

Any other apparent faults in the wiring?

Has anybody got a linux driver for this device, to share? (yocto)

Any advise and input will be appreciated.

Thank you.

Regards,

Gerhard

[amsol]

Hi Igor,

Thank you very much for the information pointers.

  I have the relevant reference now and will proceed from here.

Regards,

Gerhard Laubscher

Cape Town, South Africa

[igorpadykov]

Hi Gerhard

Variscite boards are supported by its vendor and issue may be posted on

Variscite support portal

DART-MX8M - Variscite Wiki 

i.MX8M RGMII signal description can be found in sect.11.5.4 External signal

description i.MX 8M Dual/8M QuadLite/8M Quad Applications Processors Reference Manual

Best regards
igor
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[amsol]

Hi Igor,

Thank you for your reply and reference -

I do make use of Varsicite's support service incl h/w overview service.

 I wanted alternative input, hence questions here -

From the manual reference I deduce -  (for RGMII interface)

1. MDIO has MDC as clock reference -

2. RGMII_TXC/RXC is the relevant clocks between PHY & Processor

3. therefor > ENET_PHY_REFR_CLK, on J1.1 is as I have it, is not connected to PHY  (refer my sch)

I do hope that I have made the correct deduction on this.

Regards,

Gerhard

[igorpadykov]

Hi Gerhard

examples of rgmi connections can be found in i.MX8M EVK schematic

Design Files for the i.MX 8M Evaluation Kit (EVK)

Best regards
igor