Mavell PHY 88E1112 link detection failure

[brahmamyelagatu]

Hi,

We are using Mavell PHY 88E1112 in P1021 Customized board. 88E1112 has two shared interface, one is using to connect Copper and another one to connect SFP. Both interface are connecting to MAC via SGMII port. Copper interface and  SFP interface is failed to detect any link on fiber or copper SFP module. But we are able read and write the PHY registers via MDC.MDIO bus.

Can any one share details about How to establish the PHY link and how to debug if link not succeeded .

Regards,

Brahmam.

[lunminliang]

Hi,

There is initialization steps in P1021RM.pdf, read section 15.13.1.4 SGMII Interface support.  You could also refer to AN3869 Implementing SGMII interfaces on the PowerQUICC III:

https://www.freescale.com/webapp/Download?colCode=AN3869&location=null&Parent_nodeId=&Parent_pageTyp...

For SGMII, please pay attention to below note in reference manual:

SGMII mode utilizes the internal TBI PHY. The internal TBI

PHY only auto-negotiates at 1 Gbps. However, 10 Mbps and

100 Mbps speeds are supported in SGMII mode. It is

recommended that the external PHY inform the MAC if the

desired link speed is not 1 Gbps. Software can perform MII

management cycles to determine the external PHY link speed

and program ECNTRL and MACCFG2 accordingly.

May I ask if the link failure is detected on 88E1112 side?

Have a great day,
Lunmin

[brahmamyelagatu]

Hi luminliang,

Thanks for your reply,

Link failure at PHY 88E1112 side. We're able read and Initialize the  PHY  using MDC/MDIO bus.

Regards,

Brahmam.